Yu-jie Ma, Fang-fang Li, Jia-xing Liu, Feng-yan Wang. Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 129-133. doi: 10.1063/1674-0068/cjcp1901011
Citation: Yu-jie Ma, Fang-fang Li, Jia-xing Liu, Feng-yan Wang. Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 129-133. doi: 10.1063/1674-0068/cjcp1901011

Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm

doi: 10.1063/1674-0068/cjcp1901011
Funds:  This work was supported by the National Natural Science Foundation of China (No.21673047, No.21327901, and No.21322309), the Shanghai Key Laboratory Foundation of Molecular Catalysis and Innovative Materials, and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.
  • Received Date: 2019-01-13
  • In the one-color experiment at 193 nm, we studied the photodissociation of Si2+ ions prepared by two-photon ionization using the time-sliced ion velocity map imaging method. The Si+ imaging study shows that Si2+ dissociation results in two distinct channels: Si(3Pg)+Si+(2Pu) and Si(1D2)+Si+(2Pu). The main channel Si(3Pg)+Si+(2Pu)) is produced by the dissociation of the Si2+ ions in more than one energetically available excited electronic state, which are from the ionization of Si2(v=0-5). Particularly, the dissociation from the vibrationally excited Si2(v=1) shows the strongest signal. In contrast, the minor Si(1D2)+Si+(2Pu) channel is due to an avoided crossing between the two 22Πg states in the same symmetry. It has also been observed the one-photon dissociation of Si2+(X4Σg-) into Si(1D2)+Si+(2Pu) products with a large kinetic energy release.
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Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm

doi: 10.1063/1674-0068/cjcp1901011
Funds:  This work was supported by the National Natural Science Foundation of China (No.21673047, No.21327901, and No.21322309), the Shanghai Key Laboratory Foundation of Molecular Catalysis and Innovative Materials, and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.

Abstract: In the one-color experiment at 193 nm, we studied the photodissociation of Si2+ ions prepared by two-photon ionization using the time-sliced ion velocity map imaging method. The Si+ imaging study shows that Si2+ dissociation results in two distinct channels: Si(3Pg)+Si+(2Pu) and Si(1D2)+Si+(2Pu). The main channel Si(3Pg)+Si+(2Pu)) is produced by the dissociation of the Si2+ ions in more than one energetically available excited electronic state, which are from the ionization of Si2(v=0-5). Particularly, the dissociation from the vibrationally excited Si2(v=1) shows the strongest signal. In contrast, the minor Si(1D2)+Si+(2Pu) channel is due to an avoided crossing between the two 22Πg states in the same symmetry. It has also been observed the one-photon dissociation of Si2+(X4Σg-) into Si(1D2)+Si+(2Pu) products with a large kinetic energy release.

Yu-jie Ma, Fang-fang Li, Jia-xing Liu, Feng-yan Wang. Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 129-133. doi: 10.1063/1674-0068/cjcp1901011
Citation: Yu-jie Ma, Fang-fang Li, Jia-xing Liu, Feng-yan Wang. Imaging the Dissociation Dynamics of Si2+ via Two-Photon Excitation at 193 nm[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 129-133. doi: 10.1063/1674-0068/cjcp1901011

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