钠分子（Na₂）的4(3)π(g)态：振动编号与超精细结构

The 4(3)Pi(g) State of Na(2): Vibrational Numbering and Hyperfine Structure.

作者信息

Lazarov G, Lyyra AM, Li L, Huennekens J

机构信息

Department of Physics, Temple University, Philadelphia, Pennsylvania, 19122

出版信息

J Mol Spectrosc. 1999 Aug;196(2):259-264. doi: 10.1006/jmsp.1999.7879.

DOI:10.1006/jmsp.1999.7879

PMID:10409455

Abstract

The Na(2) 4(3)Pi(g) state has been studied by continuous-wave (cw) perturbation-facilitated optical-optical double resonance (PFOODR) fluorescence excitation and resolved fluorescence spectroscopy. The absolute vibrational numbering was determined by resolved fluorescence to the a(3)Sigma(+)(u) state. The OODR excitation lines of the 4(3)Pi(g) (Kv, N) <-- b(3)Pi(u) (Kv(b)('), J') approximately A(1)Sigma(+)(u) (Kv(A)('), J') <-- X(1)Sigma(+)(g) (Kv", J") transitions show hyperfine splittings, and the hyperfine coupling scheme of the upper 4(3)Pi(g) levels is case b(betaS). Although this 4(3)Pi(g) state dissociates to the 3p + 3p atomic limit, it is a Rydberg state at a small internuclear distance, and the hyperfine splitting is caused mainly by the Fermi contact interaction of the varsigma(g)3s valence electron with the nuclei. The Fermi contact constant was determined to be b(F) = 218.3 +/- 3.9 MHz. Copyright 1999 Academic Press.

摘要

通过连续波（cw）微扰辅助光-光双共振（PFOODR）荧光激发和分辨荧光光谱对Na(2) 4(3)Pi(g)态进行了研究。通过向a(3)Sigma(+)(u)态的分辨荧光确定了绝对振动编号。4(3)Pi(g)（Kv，N）<-- b(3)Pi(u)（Kv(b)'，J'）≈ A(1)Sigma(+)(u)（Kv(A)'，J'）<-- X(1)Sigma(+)(g)（Kv"，J"）跃迁的光学光学双共振激发线显示出超精细分裂，并且上4(3)Pi(g)能级的超精细耦合方案为b(betaS)情况。尽管此4(3)Pi(g)态解离至3p + 3p原子极限，但在小核间距时它是一个里德堡态，超精细分裂主要由varsigma(g)3s价电子与原子核的费米接触相互作用引起。确定费米接触常数为b(F) = 218.3 +/- 3.9 MHz。版权所有1999年学术出版社。