Microclusters from different structures of silicon and carbon are studied by SIMS under UHV conditions in the mass range below M=200. The sputtered mass spectra of ions Sin+, Cn+ and Cn were obtained from the 10 keV O...Microclusters from different structures of silicon and carbon are studied by SIMS under UHV conditions in the mass range below M=200. The sputtered mass spectra of ions Sin+, Cn+ and Cn were obtained from the 10 keV O2+ primary beam bombardment. Comparisons of each spectrum in each group have shown the strong structure effects on the cluster patterns. A brief discussion on the results has been given.展开更多
ccording to the chemical bond theory we designed geometric structures ofcluster ions Nb_nS generated by laser ablation and calculated their electronic struc-tures using DV-X_a method of quantum chemistry. The results...ccording to the chemical bond theory we designed geometric structures ofcluster ions Nb_nS generated by laser ablation and calculated their electronic struc-tures using DV-X_a method of quantum chemistry. The results show that with theincrease of the cluster size the structures of the cluster ions change from a single-chain to a double-chain, then to a planar-net, and linking up to a net at Nb_3. Thenegative cluster ions tend to form a divergent configuration due to the extra chargeson it.展开更多
Mass spectra and wave functions of the doubly heavy baryons are computed assuming that the two heavy quarks inside a baryon form a compact heavy'diquark core'in a color anti-triplet,and bind with the remaining...Mass spectra and wave functions of the doubly heavy baryons are computed assuming that the two heavy quarks inside a baryon form a compact heavy'diquark core'in a color anti-triplet,and bind with the remaining light quark into a colorless baryon.The two reduced two-body problems are described by the relativistic Bethe-Salpeter equations(BSEs)with the relevant QCD inspired kernels.We focus on the doubly heavy baryons with 1^+heavy diquark cores.After solving BSEs in the instantaneous approximation,we present the mass spectra and the relativistic wave functions of the diquark cores,and of the low-lying baryon states J^P=(1/2)^+and(3/2)^+with flavors(ccq)(bcq)and(bbq).A comparison with other approaches is also made.展开更多
We study the mass spectra and decay process of σ and π_(0) mesons under a strong external magnetic field.To achieve this goal,we deduce the thermodynamic potential in a two-flavor,hot and magnetized Nambu-Jona-Lasin...We study the mass spectra and decay process of σ and π_(0) mesons under a strong external magnetic field.To achieve this goal,we deduce the thermodynamic potential in a two-flavor,hot and magnetized Nambu-Jona-Lasinio model.We calculate the energy gap equation through the random phase approximation(RPA).Then we use the Ritus method to calculate the decay triangle diagram and self-energy in the presence of a constant magnetic field B.Our results indicate that the magnetic field has little influence on the mass of π_(0) at low temperatures.However,for quarks andσmesons,their mass clearly changes,which reflects the influence of magnetic catalysis(MC).The presence of a magnetic field accelerates the decay of the meson while the presence of a chemical potential will decrease the decay process.展开更多
he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral ...he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral fragmenta-tion behaviour of crown ethers are suggested. The EI mass spectra of studied crownethers are in satisfactory agreenient with the predictions.展开更多
A quantitative interpretation of mass spectra of complex organic compounds so far is notvery perfect and needs some further investigation. In this paper a mechanism of cleft-rate-determining-steps of aromatic conjugat...A quantitative interpretation of mass spectra of complex organic compounds so far is notvery perfect and needs some further investigation. In this paper a mechanism of cleft-rate-determining-steps of aromatic conjugated polyenic acid, methyl benzoate, methyl phenyl ketone,benzonitrile and aniline is proposed, and various quantum parameters of molecular ions ofaromatic conjugated polyenic compounds, together with their framents are calculated bymeans of CNDO/2 method. Through the process of calculation, the peak-height of mass spectracan be quantitatively interpreted, which means that the main factors which influence the cleftforms of simple cleavage of mass spectra of conjugated compounds given by the authorsmight be true to some extent.展开更多
The m/z of characteristic ion of the mass spectra of the dichlorocarbene of dodecen-1-ols was used as a parameter to locate the position of double bond in these isomers by a new formula.
The EI mass spectra of seven 1,1'-(3-oxa-pentamethylene)-dicyclopentadienyl lanthanide and yttrium chlorides(1—7),and eleven dicyclopentadienyl lanthanide and yttrium chlorides(8—18) were investigated.Fragmentat...The EI mass spectra of seven 1,1'-(3-oxa-pentamethylene)-dicyclopentadienyl lanthanide and yttrium chlorides(1—7),and eleven dicyclopentadienyl lanthanide and yttrium chlorides(8—18) were investigated.Fragmentation patterns of these complexes were studied by using metastable ion measurements.The EI spectra of complexes 1—7 exhibited strong molecular ion peaks,the frag- mentation of molecular ions were more complicated.The EI mass spectra of complexes 8—18 sup- ported the dimeric structure under gaseous state.In the spectra of dimers(C_5H_5)_3Ln^+·observed were resulted from the skeletal rearrangement involving the migration of cyclopentadienyl moiety.展开更多
Ⅰ. INTRODUCTION Mass spectra for complexes of β-diketones of rare earth elements have already been studied. But most of them are those in which the rare earth elements coordinate to diketones with fluorated alkanes ...Ⅰ. INTRODUCTION Mass spectra for complexes of β-diketones of rare earth elements have already been studied. But most of them are those in which the rare earth elements coordinate to diketones with fluorated alkanes or heterocyclic rings. The mass spectra for complexes of 1-phenyl-3-methyl-4-(-benzoylacetyl)-pyrazolone-5 with La, Eu or Tb, the synthesis of this ligand and the study on the mass spectra of its RE-complexes are reported for the first time.展开更多
The non-relativistic radial Schr¨odinger equation is analytically solved using asymptotic iteration method within the framework of a general interaction potential whose special cases are the Cornell and Cornell p...The non-relativistic radial Schr¨odinger equation is analytically solved using asymptotic iteration method within the framework of a general interaction potential whose special cases are the Cornell and Cornell plus harmonic potentials. The energy eigenvalues expression is derived in three dimensional space, which is further used to calculate the mass spectra of ˉcc,ˉbb,ˉbc, cˉs, bˉs and b ˉq mesons. The obtained results of this work are in good agreement with experimental and other relativistic results and also improved in comparison with other non-relativistic recent studies.展开更多
Introduction Glycosyl azides are useful, versatile intermediates for the synthesis of N-glyeosyl derivatives and other biologically important non-carbohydrate derivatives since the azido group can be introduced readil...Introduction Glycosyl azides are useful, versatile intermediates for the synthesis of N-glyeosyl derivatives and other biologically important non-carbohydrate derivatives since the azido group can be introduced readily into aliphatic, aromatic and heterocyclic systems, and can be transformed into other functional groups and utilized for the synthesis of hetero-展开更多
The fast atom bobardment mass spectra of phenolate-bridged N<sub>8</sub>O<sub>3</sub> Schiff-2base cryptands derived from tris （2-aminoethyl） amine （tren） with 2, 6-dlformyl-4-R-phenol （Cr...The fast atom bobardment mass spectra of phenolate-bridged N<sub>8</sub>O<sub>3</sub> Schiff-2base cryptands derived from tris （2-aminoethyl） amine （tren） with 2, 6-dlformyl-4-R-phenol （Cryptand H<sub>3</sub>L<sup>1</sup>, R=OMe） H<sub>3</sub>L<sup>3</sup>, Br, and H<sub>3</sub>L<sup>4</sup>, Ph) in the presence of NaOH or KON in methanol at ambient temperature was investigaed and compared with IR, UV-Vis, <sup>1</sup>H and <sup>13</sup>H NMR. The characteristic spectra of the cryptates posseessing different proton form cryptands were discussed.展开更多
Non-thermal C/H/Ar plasmas are widely applied to carbonaceous material production and processing.In this work,plasma parameters and gaseous species of the atmospheric non-thermal C/H/Ar plasmas produced by an atmosphe...Non-thermal C/H/Ar plasmas are widely applied to carbonaceous material production and processing.In this work,plasma parameters and gaseous species of the atmospheric non-thermal C/H/Ar plasmas produced by an atmospheric-pressure DC arc discharge generator in CH_4/Ar were investigated.The voltage-current characteristics were measured for different CH_4/Ar ratios.Optical emission spectroscopy was employed to analyze the electron excitation temperature,gas temperature and electron density under various discharge conditions.The hydrocarbon molecules produced in the CH4/Ar plasmas were detected with photoionization mass spectrometry.The optical spectral results demonstrated that the electron excitation temperature was 0.4-1 eV,the gas temperature was 2800-4200 K and the electron density was in the range of（5-20）×10^15 cm^-3.The mass spectrum indicated that a variety of unsaturated hydrocarbons（C2H4,C3H6,C6H6,etc.） and several highly unsaturated hydrocarbons（C4H2,C5H6,etc.） were produced in the non-thermal arc plasmas.展开更多
Plasma immersion ion implantation (PI^3), a new technique with certain advantages over biological samples, was developed. Argonion as well as nitrogen ion implantation of the pea seeds has been carried out with the PI...Plasma immersion ion implantation (PI^3), a new technique with certain advantages over biological samples, was developed. Argonion as well as nitrogen ion implantation of the pea seeds has been carried out with the PI^3 implanter and their RBS spectra were also studied. The results show that the mass deposition effect of ion implantation on biological samples can be achieved with the PI^3 implanter. In addition, there is an optimal implantation time for a given treatment condition. It presents new possibilities for the ion implantation into biological samples.展开更多
文摘Microclusters from different structures of silicon and carbon are studied by SIMS under UHV conditions in the mass range below M=200. The sputtered mass spectra of ions Sin+, Cn+ and Cn were obtained from the 10 keV O2+ primary beam bombardment. Comparisons of each spectrum in each group have shown the strong structure effects on the cluster patterns. A brief discussion on the results has been given.
文摘ccording to the chemical bond theory we designed geometric structures ofcluster ions Nb_nS generated by laser ablation and calculated their electronic struc-tures using DV-X_a method of quantum chemistry. The results show that with theincrease of the cluster size the structures of the cluster ions change from a single-chain to a double-chain, then to a planar-net, and linking up to a net at Nb_3. Thenegative cluster ions tend to form a divergent configuration due to the extra chargeson it.
基金Supported in part by the National Natural Science Foundation of China(NSFC)(11745006,11535002,11575048,11675239,11805024,11821505)supported by the Key Research Program of Frontier Sciences,CAS,(QYZDY-SSW-SYS006)+1 种基金the China Postdoctoral Science Foundation(2018M641487)the Fundamental Research Funds for the Central Universities(G2019KY05110)
文摘Mass spectra and wave functions of the doubly heavy baryons are computed assuming that the two heavy quarks inside a baryon form a compact heavy'diquark core'in a color anti-triplet,and bind with the remaining light quark into a colorless baryon.The two reduced two-body problems are described by the relativistic Bethe-Salpeter equations(BSEs)with the relevant QCD inspired kernels.We focus on the doubly heavy baryons with 1^+heavy diquark cores.After solving BSEs in the instantaneous approximation,we present the mass spectra and the relativistic wave functions of the diquark cores,and of the low-lying baryon states J^P=(1/2)^+and(3/2)^+with flavors(ccq)(bcq)and(bbq).A comparison with other approaches is also made.
基金Supported by the National Natural Science Foundation of China(11735007,11890711,11890710)。
文摘We study the mass spectra and decay process of σ and π_(0) mesons under a strong external magnetic field.To achieve this goal,we deduce the thermodynamic potential in a two-flavor,hot and magnetized Nambu-Jona-Lasinio model.We calculate the energy gap equation through the random phase approximation(RPA).Then we use the Ritus method to calculate the decay triangle diagram and self-energy in the presence of a constant magnetic field B.Our results indicate that the magnetic field has little influence on the mass of π_(0) at low temperatures.However,for quarks andσmesons,their mass clearly changes,which reflects the influence of magnetic catalysis(MC).The presence of a magnetic field accelerates the decay of the meson while the presence of a chemical potential will decrease the decay process.
文摘he bond lengths and bond orders of four kinds of chemical bonds in crownethers(15) were calculated based on the model molecules using MNDO method.With the calculation results, some predictions to the EI mass spectral fragmenta-tion behaviour of crown ethers are suggested. The EI mass spectra of studied crownethers are in satisfactory agreenient with the predictions.
文摘A quantitative interpretation of mass spectra of complex organic compounds so far is notvery perfect and needs some further investigation. In this paper a mechanism of cleft-rate-determining-steps of aromatic conjugated polyenic acid, methyl benzoate, methyl phenyl ketone,benzonitrile and aniline is proposed, and various quantum parameters of molecular ions ofaromatic conjugated polyenic compounds, together with their framents are calculated bymeans of CNDO/2 method. Through the process of calculation, the peak-height of mass spectracan be quantitatively interpreted, which means that the main factors which influence the cleftforms of simple cleavage of mass spectra of conjugated compounds given by the authorsmight be true to some extent.
基金Project supported by the National Natural Science Foundation of China (No. 29575190) and the Foundation of Bioorganee and Molecular Engineering Laboratory.
文摘The m/z of characteristic ion of the mass spectra of the dichlorocarbene of dodecen-1-ols was used as a parameter to locate the position of double bond in these isomers by a new formula.
文摘The EI mass spectra of seven 1,1'-(3-oxa-pentamethylene)-dicyclopentadienyl lanthanide and yttrium chlorides(1—7),and eleven dicyclopentadienyl lanthanide and yttrium chlorides(8—18) were investigated.Fragmentation patterns of these complexes were studied by using metastable ion measurements.The EI spectra of complexes 1—7 exhibited strong molecular ion peaks,the frag- mentation of molecular ions were more complicated.The EI mass spectra of complexes 8—18 sup- ported the dimeric structure under gaseous state.In the spectra of dimers(C_5H_5)_3Ln^+·observed were resulted from the skeletal rearrangement involving the migration of cyclopentadienyl moiety.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION Mass spectra for complexes of β-diketones of rare earth elements have already been studied. But most of them are those in which the rare earth elements coordinate to diketones with fluorated alkanes or heterocyclic rings. The mass spectra for complexes of 1-phenyl-3-methyl-4-(-benzoylacetyl)-pyrazolone-5 with La, Eu or Tb, the synthesis of this ligand and the study on the mass spectra of its RE-complexes are reported for the first time.
基金financial support through the UGC-BSR fellowship
文摘The non-relativistic radial Schr¨odinger equation is analytically solved using asymptotic iteration method within the framework of a general interaction potential whose special cases are the Cornell and Cornell plus harmonic potentials. The energy eigenvalues expression is derived in three dimensional space, which is further used to calculate the mass spectra of ˉcc,ˉbb,ˉbc, cˉs, bˉs and b ˉq mesons. The obtained results of this work are in good agreement with experimental and other relativistic results and also improved in comparison with other non-relativistic recent studies.
基金Supported by the National Natural Science Foundation of China
文摘Introduction Glycosyl azides are useful, versatile intermediates for the synthesis of N-glyeosyl derivatives and other biologically important non-carbohydrate derivatives since the azido group can be introduced readily into aliphatic, aromatic and heterocyclic systems, and can be transformed into other functional groups and utilized for the synthesis of hetero-
文摘The fast atom bobardment mass spectra of phenolate-bridged N<sub>8</sub>O<sub>3</sub> Schiff-2base cryptands derived from tris （2-aminoethyl） amine （tren） with 2, 6-dlformyl-4-R-phenol （Cryptand H<sub>3</sub>L<sup>1</sup>, R=OMe） H<sub>3</sub>L<sup>3</sup>, Br, and H<sub>3</sub>L<sup>4</sup>, Ph) in the presence of NaOH or KON in methanol at ambient temperature was investigaed and compared with IR, UV-Vis, <sup>1</sup>H and <sup>13</sup>H NMR. The characteristic spectra of the cryptates posseessing different proton form cryptands were discussed.
基金supported by National Natural Science Foundation of China(Nos.11035005,11475174,50876101)USTC-NSRL Association Funding(No.KY2090130001)
文摘Non-thermal C/H/Ar plasmas are widely applied to carbonaceous material production and processing.In this work,plasma parameters and gaseous species of the atmospheric non-thermal C/H/Ar plasmas produced by an atmospheric-pressure DC arc discharge generator in CH_4/Ar were investigated.The voltage-current characteristics were measured for different CH_4/Ar ratios.Optical emission spectroscopy was employed to analyze the electron excitation temperature,gas temperature and electron density under various discharge conditions.The hydrocarbon molecules produced in the CH4/Ar plasmas were detected with photoionization mass spectrometry.The optical spectral results demonstrated that the electron excitation temperature was 0.4-1 eV,the gas temperature was 2800-4200 K and the electron density was in the range of（5-20）×10^15 cm^-3.The mass spectrum indicated that a variety of unsaturated hydrocarbons（C2H4,C3H6,C6H6,etc.） and several highly unsaturated hydrocarbons（C4H2,C5H6,etc.） were produced in the non-thermal arc plasmas.
文摘Plasma immersion ion implantation (PI^3), a new technique with certain advantages over biological samples, was developed. Argonion as well as nitrogen ion implantation of the pea seeds has been carried out with the PI^3 implanter and their RBS spectra were also studied. The results show that the mass deposition effect of ion implantation on biological samples can be achieved with the PI^3 implanter. In addition, there is an optimal implantation time for a given treatment condition. It presents new possibilities for the ion implantation into biological samples.
