Twohyphen;photon spectroscopy at ultrahigh resolution: Fine structure and hyperfine structure of the (3ssgr;)Athinsp;2Sgr;+(v=1,N=3) Rydberg state of NO

摘要

The utility of ultrahigh resolution, continuoushyphen;wave laser sources in multiphoton spectroscopy is demonstrated by measurements of fluorescence excitation spectra resulting from twohyphen;photon pumping of individual rotational branches of (3ssgr;)Athinsp;2Sgr;+(vrsquo;=1,Nrsquo;=3)larr;Xthinsp;2Pgr;(vrsquo;=0) NO. The general physical significance of fine structure and hyperfine structure interactions is briefly discussed emphasizing their relation to dynamical phenomena. Current observations yield the following fine structure and hyperfine structure parameters characterizingA(v=1,N=3) NO: ggr;=minus;80.10plusmn;0.04 MHz,b=40.9plusmn;0.2 MHz,c=1.5plusmn;4.5 MHz, andeQq=minus;7.2plusmn;0.5 MHz. The effective cross section for twohyphen;photon excitation ofR11(Jlsquo;=2.5) is estimated from experimental observables to be 1times;10minus;44cm4thinsp;s.