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Spin-orbit Splitting and Lifetime Broadening in the A2Δ Electronic State of l-C5H
Mohammad Ali Haddad,Dong-feng Zhao*,Harold Linnartz,Wim Ubachs
Author NameAffiliationE-mail
Mohammad Ali Haddad Institute for Lasers, Life, and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, the Netherlands  
Dong-feng Zhao* Institute for Lasers, Life, and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, the Netherlands d.zhao@vu.nl 
Harold Linnartz Institute for Lasers, Life, and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, the NetherlandsSackler Laboratory for Astrophysics, Leiden Observatory, University of Leiden, PO Box 9513, NL 2300 RA Leiden, the Netherlands  
Wim Ubachs Institute for Lasers, Life, and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, the Netherlands  
Abstract:
Optical absorption bands at ~18772 and ~18807 cm-1, previously assigned to A2Δ-X2Π electronic origin band transitions of the linear carbon-chain radicals C5H and C5D, respec-tively, have been reinvestigated. The spectra have been recorded in direct absorption apply-ing cavity ring-down spectroscopy to a supersonically expanding acetylene/helium plasma. The improved spectra allow deducing a l-C5H upper state spin-orbit coupling constant A'=-0.7(3) cm-1 and a A2Δ lifetime of 1.6±0.3 ps.
Key words:  Cavity ring down spectroscopy, Carbon-chain radical, Interstellar molecule, C5H
FundProject:
线形C5H自由基A2Δ电子态的自选轨道分裂和寿命展宽
Mohammad Ali Haddad,赵东锋*,Harold Linnartz,Wim Ubachs
摘要:
重新研究了C5H和C5D自由基A2Δ-X2Π电子吸收谱带. 利用乙炔/氦混合气脉冲直流放电产生的碳氢等离子体制备气相C5H和C5D自由基,利用光腔衰荡光谱记录碳氢等离子体束的直接吸收光谱. 与之前工作相比,实验光谱的波长校准得到了改进. 通过对实验光谱的分析,首次实验确定了C5H自由基A2Δ电子态的自旋-轨道分裂常数为-0.7(3) cm-1. 这为标识A2¢电子态的提供了有力的实验证据. 通过对谱带寿命展宽的分析,A2Δ电子态的寿命估测为1.6±0.3 ps.
关键词:  光腔衰荡光谱,碳链自由基,星际分子,C5H
DOI:10.1088/1674-0068/25/02/129-134
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