Ortho-para mixing interaction in the vinyl radical detected by millimeter-wave spectroscopy

Keiichi Tanaka, Masato Hayashi, Mitsuhiko Ohtsuki, Kensuke Harada, Takehiko Tanaka

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Ortho-para mixing interaction due to the coupling of nuclear and electron spins was detected for the first time by millimeter-wave spectroscopy of the deuterated vinyl radical H2CCD. The ground state of H2CCD is split by the deuteron tunneling into two components 0+ and 0 - separated by ΔE0 =1186.794(16) MHz. Rotational levels in the 0+ and 0- states, one being an ortho level and the other a para level, are coupled by the interaction expressed by 〈0 ±|H′|0〉=(δa F/2)S ·(I1-I2), where I1 and I2 are spins of the two protons and S is the electron spin. The δaF constant has been determined to be 68.06(52) MHz. The para to ortho conversion rate constant is predicted to be 1.2×105 s-1 torr-1.

Original languageEnglish
Article number111101
JournalJournal of Chemical Physics
Issue number11
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

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


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