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Control of the photoionization/photodissociation processes of cyclopentanone with trains of femtosecond laser pulses 被引量:3
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作者 宋耀东 陈洲 +3 位作者 杨雪 孙长凯 张丛丛 胡湛 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第10期240-246,共7页
A train of three equally spaced femtosecond laser pulses is employed to control the photoionization/photodissociation processes of cyclopentanone. With the increase of pulse separation, a strong modulation of product ... A train of three equally spaced femtosecond laser pulses is employed to control the photoionization/photodissociation processes of cyclopentanone. With the increase of pulse separation, a strong modulation of product ion yield is observed. More than ten-fold changes of ion yield ratio between different products can be realized. The experimental observations further explain the compositions and formation pathways of peaks in the mass spectra. The controlling mechanisms are also discussed. 展开更多
关键词 shaped femtosecond pulse coherent control time-of-flight mass spectra photoionization and photodissociation
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Investigation of Vacuum Ultraviolet Photoionization of Methylcyclohexane in Energy Region of 9-15.5 eV 被引量:1
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作者 Hang Zhang Yan-bo Li +7 位作者 Long Zhu Jun Chen Ye-peng Yu Zhao-hui Li Xuan Lin Xiao-bin Shan Fu-yi Liu Liu-si Sheng 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第3期296-302,I0002,共8页
Vacuum ultraviolet(VUV)photoionization and photodissociation of methylcyclohexane have been studied utilizing a reflectron time-of-flight mass spectrometer(RTOF-MS)with synchrotron radiation source.Photoionization eff... Vacuum ultraviolet(VUV)photoionization and photodissociation of methylcyclohexane have been studied utilizing a reflectron time-of-flight mass spectrometer(RTOF-MS)with synchrotron radiation source.Photoionization efficiency curves(PIEs)of molecule ion C7H14^+ and fragment ions C7H13^+,C6H11^+,C6H10+,C5H10^+,C5H9^+,C4H8^+,C4H7^+,and C3H5^+ were observed.The ionization energy of methylcyclohexane was measured to be(9.80±0.03)eV,and appearance energies of fragment ions were determined from the PIEs.Optimized structures of transitional states,intermediates and product ions were characterized at the B3LYP/6-31G(d)level and the energies were calculated using G3B3 method.Formation channels of dominating fragment ions were proposed.Intramolecular hydrogen migrations and carbon ring-opening were the foremost processes in fragmentation pathways of methylcyclohexane. 展开更多
关键词 METHYLCYCLOHEXANE photoionization and photodissociation Synchrotron radiation source Reflectron time-of-flight mass spectrometer
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