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首页> 外文期刊>Chemical Physics Letters >Near UV photodissociation of CD3SCD3: CD3 fragment (v, J) vector correlations
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Near UV photodissociation of CD3SCD3: CD3 fragment (v, J) vector correlations

机译:CD3SCD3的近紫外光解离:CD3片段(v,J)矢量相关

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摘要

The alignment of CD3 fragments following the photodissociation of fully deuterated dimethyl sulfide (CD3SCD3) on the first absorption band (at 219 nm) has been characterised using (2 + 1) resonance-enhanced multiphoton ionization (REMPI) spectroscopy. Operation of the time-of-flight (TOF) mass spectrometer with a low ion extraction field rejects off-axis travelling CD3 fragments, allowing velocity-selected REMPI spectra to be obtained. The strong dependence of the REMPI signal on the polarization of the probe laser is adequately explained by an impulsive model dissociation where the fragments recoil axially along the CD3S-CD3 bond. In general, the methyl fragments are found to be preferentially spinning about their C-3 axis after photodissociation, correlating with zero-point torsional vibrational motion of the parent molecule. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 32]
机译:在完全吸收的氘化二甲基硫醚(CD3SCD3)在第一个吸收谱带(219 nm)上进行光离解后,CD3片段的排列已使用(2 + 1)共振增强多光子电离(REMPI)光谱进行了表征。飞行时间(TOF)质谱仪在低离子提取场的条件下运行,可抑制离轴的CD3碎片,从而获得速度选择的REMPI光谱。 REMPI信号对探测激光偏振的强烈依赖性可以通过脉冲模型解离得到充分解释,其中碎片沿着CD3S-CD3键轴向反冲。通常,发现甲基片段在光解离后优先绕其C-3轴旋转,这与母体分子的零点扭转振动运动有关。 (C)2003 Elsevier Science B.V.保留所有权利。 [参考:32]

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