Volume 33 Issue 6
Dec.  2020
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Fei Xu, Yu-xin Tan, Dao-fu Yuan, Wen-tao Chen, Sheng-rui Yu, Ting Xie, Tao Wang, Xue-ming Yang, Xing-an Wang. Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 691-696. doi: 10.1063/1674-0068/cjcp2008147
 Citation: Fei Xu, Yu-xin Tan, Dao-fu Yuan, Wen-tao Chen, Sheng-rui Yu, Ting Xie, Tao Wang, Xue-ming Yang, Xing-an Wang. Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 691-696.

# Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel

##### doi: 10.1063/1674-0068/cjcp2008147
• Corresponding author: Dao-fu Yuan, E-mail: ydfu@ustc.edu.cn; Xue-ming Yang, E-mail: xmyang@dicp.ac.cn; Xing-an Wang, E-mail:xawang@ustc.edu.cn
• Authors contributed equally to this work.
• Accepted Date: 2020-09-28
• Publish Date: 2020-12-27
• The vacuum ultraviolet photodissociation of OCS via the $F$ $3^1\Pi$ Rydberg states was investigated in the range of 134$-$140 nm by means of the time-sliced velocity map ion imaging technique. The images of S($^1$D$_2$) products from the CO($X^1\Sigma^+$)+S($^1$D$_2$) dissociation channel were acquired at five photolysis wavelengths, corresponding to a series of symmetric stretching vibrational excitations in OCS($F$ $3^1\Pi$, $v_1$=0$-$4). The total translational energy distributions, vibrational populations and angular distributions of CO($X^1\Sigma^+$, $v$) coproducts were derived. The analysis of experimental results suggests that the excited OCS molecules dissociate to CO($X^1\Sigma^+$) and S($^1$D$_2$) products via non-adiabatic couplings between the upper $F$ $3^1\Pi$ states and the lower-lying states both in the C$_{\infty \textrm{v}}$ and C$_{\rm{s}}$ symmetry. Furthermore, strong wavelength dependent behavior has been observed: the greatly distinct vibrational populations and angular distributions of CO($X^1\Sigma^+$, $v$) products from the lower ($v_1$=0$-$2) and higher ($v_1$=3, 4) vibrational states of the excited OCS($F$ $3^1\Pi$, $v_1$) demonstrate that very different mechanisms are involved in the dissociation processes. This study provides evidence for the possible contribution of vibronic coupling and the crucial role of vibronic coupling on the vacuum ultraviolet photodissociation dynamics.
• Authors contributed equally to this work.
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###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

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## Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel

##### doi: 10.1063/1674-0068/cjcp2008147
###### Corresponding author:Dao-fu Yuan, E-mail: ydfu@ustc.edu.cn; Xue-ming Yang, E-mail: xmyang@dicp.ac.cn; Xing-an Wang, E-mail:xawang@ustc.edu.cn

Abstract: The vacuum ultraviolet photodissociation of OCS via the $F$ $3^1\Pi$ Rydberg states was investigated in the range of 134$-$140 nm by means of the time-sliced velocity map ion imaging technique. The images of S($^1$D$_2$) products from the CO($X^1\Sigma^+$)+S($^1$D$_2$) dissociation channel were acquired at five photolysis wavelengths, corresponding to a series of symmetric stretching vibrational excitations in OCS($F$ $3^1\Pi$, $v_1$=0$-$4). The total translational energy distributions, vibrational populations and angular distributions of CO($X^1\Sigma^+$, $v$) coproducts were derived. The analysis of experimental results suggests that the excited OCS molecules dissociate to CO($X^1\Sigma^+$) and S($^1$D$_2$) products via non-adiabatic couplings between the upper $F$ $3^1\Pi$ states and the lower-lying states both in the C$_{\infty \textrm{v}}$ and C$_{\rm{s}}$ symmetry. Furthermore, strong wavelength dependent behavior has been observed: the greatly distinct vibrational populations and angular distributions of CO($X^1\Sigma^+$, $v$) products from the lower ($v_1$=0$-$2) and higher ($v_1$=3, 4) vibrational states of the excited OCS($F$ $3^1\Pi$, $v_1$) demonstrate that very different mechanisms are involved in the dissociation processes. This study provides evidence for the possible contribution of vibronic coupling and the crucial role of vibronic coupling on the vacuum ultraviolet photodissociation dynamics.

Authors contributed equally to this work.
Fei Xu, Yu-xin Tan, Dao-fu Yuan, Wen-tao Chen, Sheng-rui Yu, Ting Xie, Tao Wang, Xue-ming Yang, Xing-an Wang. Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 691-696. doi: 10.1063/1674-0068/cjcp2008147
 Citation: Fei Xu, Yu-xin Tan, Dao-fu Yuan, Wen-tao Chen, Sheng-rui Yu, Ting Xie, Tao Wang, Xue-ming Yang, Xing-an Wang. Wavelength Dependent Photodissociation of OCS via $F$ ${3^1\Pi}$ Rydberg State: CO(${X^1\Sigma^+}$)+S($^{1}$D$_{2}$) Product Channel[J]. Chinese Journal of Chemical Physics , 2020, 33(6): 691-696.
Reference (26)

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