Laser-Induced Fluorescence Excitation Spectroscopy of Highly Vibrationally Excited Ã2A1 NH2 Radical

✍ Scribed by C.H. Chang; S.C. Lin; Y.T. Chen

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 486 KB
• Volume: 169
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1035

✦ Synopsis

Eighty spin-rovibronic transitions in (\mathrm{NH}{2} \dot{A}^{2} \mathrm{~A}{1}(0,10,0)^{K_{a}=1} \leftarrow \tilde{X}^{2} B_{1}(0,0,0)^{K_{a}=0.2}) and (\dot{A}^{2} A_{1}(0). (12,0)^{K_{a}-0} \leftarrow \hat{X}^{2} B_{1}(0,2,0)^{K_{a}-1}) have been observed in the range (28810-29220 \mathrm{~cm}^{-1}). The spectral resolution ( (\Delta \nu \sim 0.03 \mathrm{~cm}^{-1}) ) of the present investigation has resolved many electron-spin doublets. The observed high-lying (\Pi(0,10,0)) and (\Sigma(0,12,0)) vibrational states of (\mathrm{NH}{2} \tilde{A}^{2} A{1}) were only subjected to minor perturbations, despite the molecule undergoing a large-amplitude bending vibration. The molecular constants. (T=29036.13(7) \mathrm{cm}^{-1}, B=9.671(6) \mathrm{cm}^{-1}, A=0.93(25)) (\mathrm{cm}^{-1}), and (q=2.25(1) \mathrm{cm}^{-1}), of (\mathrm{NH}{2} \dot{A}^{2} A{1} \mathrm{II}(0,10.0)) have been obtained from a least-squares fit to the spectroscopically determined spin-rovibronic term values. The spectroscopic constants of (\mathrm{NH}{2} \hat{A}^{2} A{\mathrm{i}} \Sigma(0,12,0), T=32115.9(14) \mathrm{cm}^{-1}) and (B=10.33(18) \mathrm{cm}^{-1}), have also been determined from the present data. (c) 1995 Academic Press. Inc.