The v = 3 <-- 0 S(0)-S(3) Electric Quadrupole Transitions of H2 near 0.8 μm - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2012

The v = 3 <-- 0 S(0)-S(3) Electric Quadrupole Transitions of H2 near 0.8 μm

S.-M. Hu
  • Fonction : Auteur
H. Pan
  • Fonction : Auteur
C.-F. Cheng
  • Fonction : Auteur
Y. R. Sun
  • Fonction : Auteur
X.-F. Li
  • Fonction : Auteur
J. Wang
  • Fonction : Auteur
A. Campargue
A.-W. Liu
  • Fonction : Auteur

Résumé

The very weak S(0)-S(3) electric quadrupole transitions of the second overtone band of molecular hydrogen have been recorded in the laboratory by continuous-wave cavity ring-down spectroscopy near 0.8 μm. The ultrahigh sensitivity of the spectrometer (αmin ~ 1 × 10-10 cm-1) allows us to detect the considered transitions at a relatively low sample pressure (50-750 torr). The line positions, intensity, and pressure-shift coefficients are derived from a fit of the line shape using a Galatry profile. Compared with literature values, the relative differences between the experimental and theoretical transition intensities are reduced by one order of magnitude, reaching a value of about 2% mainly dependent of the line-shape function adopted for the profile fitting. The thermal equilibrium relative intensity of the S(1) to S(0) line is determined with an accuracy of 0.4%, which can be used to probe the ortho- to para-H2 concentration ratio. Our measurements confirm the quality of the high-level ab initio calculations, including the relativistic and quantum electrodynamics corrections.

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Dates et versions

hal-01005793 , version 1 (13-06-2014)

Identifiants

Citer

S.-M. Hu, H. Pan, C.-F. Cheng, Y. R. Sun, X.-F. Li, et al.. The v = 3 <-- 0 S(0)-S(3) Electric Quadrupole Transitions of H2 near 0.8 μm. The Astrophysical Journal, 2012, 749, pp.76. ⟨10.1088/0004-637X/749/1/76⟩. ⟨hal-01005793⟩

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