Molecular beam measurement of the magnetic susceptibility anisotropies and molecular quadrupole moment in H2CO

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Abstract

The molecular Zeeman effect in formaldehyde was studied using a molecular beam maser spectrometer in fields to 17 kG. The molecular resonance linewidth was 5 kHz. ΔM = 0 and Δlf=±1 transitions were observed for the 110→111 rotational transition. The measured susceptibility anisotropies (in units of 10-6 erg/G 2·mole) are 2χaaχbb- χcc = 25.4±0.2 and 2χbbaa- χcc= -4.1±0.15. The molecular quadrupole moment obtained from thisdata (in units of 10-25 esu·cm2) are Qaa= -0.06±0.16, Qbb=0.33±0.12, and Q cc = - 0.27±0.20. The Stark effect produced by the motion of the molecules in the magnetic field (v̄×B̄) was clearly observed.

Original languageEnglish (US)
Pages (from-to)105-110
Number of pages6
JournalThe Journal of Chemical Physics
Volume54
Issue number1
StatePublished - Dec 1 1971
Externally publishedYes

ASJC Scopus subject areas

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

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