Citation: ZHOU Dan-Na, CHEN Lin, WU Dan, ZHANG Li-Min. Photodissociation Spectra of OCS⁺ via A²П←X²П Transitions[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 963-970. doi: 10.3866/PKU.WHXB201202162 shu

Photodissociation Spectra of OCS⁺ via A²П←X²П Transitions

1.
Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 5 December 2011
Available Online: 16 February 2012
Fund Project: 国家自然科学基金(21073177)资助项目 (21073177)

In the wavelength range 260-325 nm, we obtained mass-resolved dissociation spectra of OCS⁺ via A²П_3/2←X²П_3/2 (000) and A²П_1/2←X²П_1/2 (000, 001) transitions by preparing OCS⁺ (X²П) ions via [3+1] resonance enhanced multiphoton ionization (REMPI) of OCS molecules at 423, 420, 412.2, and 408.4 nm. The mass-resolved dissociation spectra of OCS⁺ via A²П_1/2←X²П_1/2 (001) were observed for the first time. The spectroscopic constants T₀=31411.3 cm^-1 and v₁=814.3 cm^-1 for the OCS⁺ (A²П_3/2) state were deduced from the A²П_3/2←X²П_3/2 (000) photodissociation spectra, and the spectroscopic constants v₁=816 cm^-1, v₂=(380.4± 2.8) cm^-1, and v₃=(2052.7±5.1) cm^-1 for the OCS⁺ (A²П_1/2) state were deduced from the A²П_1/2←X²П_1/2 (000) spectra. The spectroscopic constant v₁=786.4 cm^-1 was deduced from the A²П_1/2←X²П_1/2 (001) photodissociation spectra. The results show that the C－O stretching mode excitation of X²П_1/2 can affect the C－S stretching mode vibration of the A²П_1/2 state via A²П_1/2←X²П_1/2 (001) transitions. Bands involving the bending v₂ mode excitation of A2П, such as A²П_1/2 (020, 120, 021, …), were observed for the A²П_1/2←X²П_1/2 (000, 001) transitions, but were not observed for the A²П_3/2 (υ₁υ₂υ₃) ←X²П_3/2 (000) transitions in the photodissociation spectra. The reason for this dependence of the bending v₂ mode excitation of A²П on the spin-orbit splitting of the ²П state can be attributed to the Fermi resonance and Renner-Teller effect of OCS⁺ (A²П).
- OCS⁺,
- Photodissociation,
- Bending mode excitation,
- Photofragment excitation spectrum
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沈阳化工大学材料科学与工程学院沈阳 110142

Photodissociation Spectra of OCS+ via A2П←X2П Transitions

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通讯作者: 陈斌, bchen63@163.com

Photodissociation Spectra of OCS⁺ via A²П←X²П Transitions