OCS+经由A2П←X2П激发的光解离光谱

doi:10.3866/PKU.WHXB201202162

Abstract

Abstract: 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).

Key words: OCS⁺, Photodissociation, Bending mode excitation, Photofragment excitation spectrum

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

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Photodissociation Spectra of OCS⁺ via A²П←X²П Transitions

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Photodissociation Spectra of OCS⁺ via A²П←X²П Transitions