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A1Σ state lifetime and predissociation of CuH
陈旸
Author NameAffiliationE-mail
陈旸 中国科学技术大学 yangchen@ustc.edu.cn 
Abstract:
A combined cavity ringdown (CRD) and laser induced fluorescence (LIF) spectroscopic study on the A1Σ ?X1Σ transition of CuH has been presented. The CuH molecules, as well as its deuterated isotopologues CuD, are produced in a supersonic jet expansion by discharging H2 (or D2) and Ar gas mixtures using two copper needles. Different profiles of relative line intensities are observed between the measured LIF and CRD spectra, providing an experimental evidence for the prediccociation behavior in the A1Σ state of CuH. The lifetimes of individual upper rotational levels are measured by LIF, from which the J′-dependent predissociate rates are obtained. Based on the previous theoretical calculations, the predissociation mechanism is concluded to due to the strong spin-orbit coupling between the A1Σ state and the lowest-lying triplet 3Σ state, and a tunneling effect may also be involved in the predissociation. Similar experiments are also performed for CuD, showing that the A1Σ state of CuD does not undergo a predissociation process.
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FundProject:
A1Σ state lifetime and predissociation of CuH
陈旸
摘要:
A combined cavity ringdown (CRD) and laser induced fluorescence (LIF) spectroscopic study on the A1Σ ?X1Σ transition of CuH has been presented. The CuH molecules, as well as its deuterated isotopologues CuD, are produced in a supersonic jet expansion by discharging H2 (or D2) and Ar gas mixtures using two copper needles. Different profiles of relative line intensities are observed between the measured LIF and CRD spectra, providing an experimental evidence for the prediccociation behavior in the A1Σ state of CuH. The lifetimes of individual upper rotational levels are measured by LIF, from which the J′-dependent predissociate rates are obtained. Based on the previous theoretical calculations, the predissociation mechanism is concluded to due to the strong spin-orbit coupling between the A1Σ state and the lowest-lying triplet 3Σ state, and a tunneling effect may also be involved in the predissociation. Similar experiments are also performed for CuD, showing that the A1Σ state of CuD does not undergo a predissociation process.
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