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 journalArticle

8 Citations (Scopus)

Abstract

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
Volume131
Issue number11
DOIs
Publication statusPublished - Dec 1 2009

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vinyl radical
Millimeter waves
millimeter waves
Spectroscopy
electron spin
Electrons
Deuterium
Ground state
spectroscopy
Protons
Rate constants
interactions
nuclear spin
deuterons
ground state
protons

All Science Journal Classification (ASJC) codes

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

Cite this

Ortho-para mixing interaction in the vinyl radical detected by millimeter-wave spectroscopy. / Tanaka, Keiichi; Hayashi, Masato; Ohtsuki, Mitsuhiko; Harada, Kensuke; Tanaka, Takehiko.

In: Journal of Chemical Physics, Vol. 131, No. 11, 111101, 01.12.2009.

Research output: Contribution to journalArticle

Tanaka, Keiichi ; Hayashi, Masato ; Ohtsuki, Mitsuhiko ; Harada, Kensuke ; Tanaka, Takehiko. / Ortho-para mixing interaction in the vinyl radical detected by millimeter-wave spectroscopy. In: Journal of Chemical Physics. 2009 ; Vol. 131, No. 11.
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