Spectroscopic Study of N2(b1螤u, 谓 = 8) by Atmospheric-Pressure Resonant-Enhanced Multiphoton Ionization and Fluorescence Detection

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• 作者：Steven F. Adams ; James M. Williamson
• 刊名：Journal of Physical Chemistry A
• 出版年：2013
• 出版时间：December 19, 2013
• 年：2013
• 卷：117
• 期：50
• 页码：13535-13542
• 全文大小：354K
• 年卷期：v.117,no.50(December 19, 2013)
• ISSN：1520-5215

文摘

A spectroscopic analysis of the strongly perturbed N₂(b¹螤_u, 谓 = 8) state has been conducted, accounting for b¹螤_u(谓 = 8) 鈫?X ¹危_g⁺(谓 = 0) transitions, for the first time, up to J鈥?= 20. A novel laser spectroscopy technique, using a combination of resonant-enhanced multiphoton ionization and fluorescence detection at atmospheric pressure, avoids the severe effects of perturbation reported in past extreme vacuum ultraviolet absorption experiments that produced weak and unusable spectra for the 谓 = 8 level. The R, Q, and P branches of the three-photon absorption transition b¹螤_u(谓 = 8) 鈫?X¹危_g⁺(谓 = 0) were fit, allowing rotational term energy assignment up to J鈥?= 20 and molecular constants to be determined. Evidence of the previously suspected perturbation in b¹螤_u(谓 = 8) is clear in this data, with significant 螞-type doubling at higher J鈥?along with an anomalous negative value determined for the centrifugal distortion coefficient.