The multiple scattering cluster (MSC) method has been employed to perform a theoretical analysis on carbon is near edge X-ray absorption fine structure of the deuteron acetylene (C2 D2) adsorbed on Si(111)7× 7 at...The multiple scattering cluster (MSC) method has been employed to perform a theoretical analysis on carbon is near edge X-ray absorption fine structure of the deuteron acetylene (C2 D2) adsorbed on Si(111)7× 7 at room temperature. From the MSC study. it is confirmed that the (22D2 molecule is bonded to a pair of adjacent Si adatom and Si restatom with C-Si bond length about 0.18nm. The carbon-deuteron bond is bent away front the surface and the CCD bond angle is about 120°. The molecule plane tilt slightly away from the surface normal. Compared with C2D2 in gas phase, the C-C bond and C-D bond are elongated by about 0.03nm and 0.02nm respectively when acetylene was adsorbed on the subtrate. Keyowrds: adsorption of deuteron acetylene on Si(111)7×7. near edge X- ray absorption fine structure. multiple scattering cluster method展开更多
With the development of the technique of preparing thin film, artificial superlattices of high-T<sub>c</sub>oxides, especially （YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub&...With the development of the technique of preparing thin film, artificial superlattices of high-T<sub>c</sub>oxides, especially （YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>）<sub>n</sub>/（PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>）<sub>m</sub>, have attracted much attention due to the possibilities of studying a variety of superconducting physical properties otherwise inaccessible. One of the many interesting characteristics of this system is the reduction of T<sub>c</sub> with increase of the thickness of the PrBCO layer in superlattices with thin YBCO layer, which has been observed by many groups. Several theoretical models have been proposed to account for this interesting phenomenon, including a spin polaron model,展开更多
基金The authors acknowledge the financial support of the National Natural Science Foun-dation of China (Grant No.19974036)
文摘The multiple scattering cluster (MSC) method has been employed to perform a theoretical analysis on carbon is near edge X-ray absorption fine structure of the deuteron acetylene (C2 D2) adsorbed on Si(111)7× 7 at room temperature. From the MSC study. it is confirmed that the (22D2 molecule is bonded to a pair of adjacent Si adatom and Si restatom with C-Si bond length about 0.18nm. The carbon-deuteron bond is bent away front the surface and the CCD bond angle is about 120°. The molecule plane tilt slightly away from the surface normal. Compared with C2D2 in gas phase, the C-C bond and C-D bond are elongated by about 0.03nm and 0.02nm respectively when acetylene was adsorbed on the subtrate. Keyowrds: adsorption of deuteron acetylene on Si(111)7×7. near edge X- ray absorption fine structure. multiple scattering cluster method
文摘With the development of the technique of preparing thin film, artificial superlattices of high-T<sub>c</sub>oxides, especially （YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>）<sub>n</sub>/（PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>）<sub>m</sub>, have attracted much attention due to the possibilities of studying a variety of superconducting physical properties otherwise inaccessible. One of the many interesting characteristics of this system is the reduction of T<sub>c</sub> with increase of the thickness of the PrBCO layer in superlattices with thin YBCO layer, which has been observed by many groups. Several theoretical models have been proposed to account for this interesting phenomenon, including a spin polaron model,
