First observation of the quasibound levels and tunneling line broadening in the 3 1Πg state of Na2 using an ultrasensitive ionization detector

Chin Chun Tsai, John T. Bahns, William C. Stwalley

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All quasibound vibrational energy levels v=27 and 28 of the Na2 3 1Πg state were accessed by using optical - optical double resonance and detected with a shielded ionization detector. The line broadening due to the tunneling effect was observed to be larger than 1 cm -1 at the rovibrational level v=28, J=31. The potential curve has been determined by the Rydberg - Klein - Rees method and modified using Jeung's calculation for the large distance barrier and comparison of the calculated and the measured line widths. The barrier height was found to be ∼126 cm -1 above its asymptotic limit (3s+4p) at 5.98 Å. There also exists an unobserved shallow outer well with depth ∼35 cm-1 at 9.5 Å according to our modification of Jeung's calculated potential. One way to possibly probe this outer well is also discussed.

Original languageEnglish
Pages (from-to)7417-7423
Number of pages7
JournalThe Journal of Chemical Physics
Issue number10
Publication statusPublished - 1993 Jan 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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