砷化碘的b1Σ⁺(b0(+)) --> X3Σ⁻(X10(+), X21)以及a1Δ(a2) --> X21跃迁

The b1Sigma+(b0(+)) --> X3Sigma-(X10(+), X21) and a1Delta(a2) --> X21 Transitions of AsI.

作者信息

Beutel M, Setzer KD, Fink EH

机构信息

Physikalische Chemie-Fachbereich 9, Bergische Universität-Gesamthochschule Wuppertal, Wuppertal, D-42097, Federal Republic of Germany

出版信息

J Mol Spectrosc. 1999 Apr;194(2):250-255. doi: 10.1006/jmsp.1998.7799.

DOI:10.1006/jmsp.1998.7799

PMID:10079164

Abstract

Emission spectra of the b1Sigma+(b0(+)) --> X3Sigma-(X10(+), X21) and a1Delta(a2) --> X21 transitions of AsI have been measured in the near-infrared spectral region with a Fourier-transform spectrometer. The arsenic iodide radicals were generated and excited in a fast-flow system by reaction of arsenic vapor (Asx) with iodine and microwave-discharged oxygen. The most prominent features in the spectrum are six band sequences of the strong b1Sigma+(b0(+)) --> X3Sigma-(X10(+)) transition in the range 800-900 nm. With much lower intensities the hitherto unknown b1Sigma+(b0(+)) --> X3Sigma-(X21) subsystem and the a1Delta(a2) --> X21 transition near 1660 nm are observed. Vibrational analyses have yielded improved molecular constants for the X10(+) and b0(+) states and first values of the electronic energies and vibrational constants of the X21 and a2 states (in cm-1), X21: Te = 289.8(2), omegae = 255.2(2), omegaexe = 0.68(7), a2: Te = 6305.4(3), omegae = 267.8(1), omegaexe = 0.56(2), where the numbers in parentheses are the standard deviations of the parameters. Copyright 1999 Academic Press.

摘要

利用傅里叶变换光谱仪在近红外光谱区域测量了AsI的b1Σ⁺(b0(⁺))→X3Σ⁻(X10(⁺), X21)和a1Δ(a2)→X21跃迁的发射光谱。在快速流动系统中，通过砷蒸气（Asx）与碘以及微波放电氧气的反应生成并激发碘化砷自由基。光谱中最显著的特征是在800 - 900 nm范围内b1Σ⁺(b0(⁺))→X3Σ⁻(X10(⁺))强跃迁的六个谱带序列。还观察到强度低得多的迄今未知的b1Σ⁺(b0(⁺))→X3Σ⁻(X21)子系统以及在1660 nm附近的a1Δ(a2)→X21跃迁。振动分析得到了X10(⁺)和b0(⁺)态改进的分子常数以及X21和a2态的电子能量和振动常数的首个值（单位：cm⁻¹），X21：Te = 289.8(2)，ωe = 255.2(2)，ωexe = 0.68(7)，a2：Te = 6305.4(3)，ωe = 267.8(1)，ωexe = 0.56(2)，其中括号内的数字是参数的标准偏差。版权所有1999年，学术出版社。