Pure rotational and vibration–rotational Raman spectra of tritium, 3H2

Abstract

The pure rotational and vibration–rotational Raman spectra of tritium, ³H₂, have been recorded and analysed. The following rotational constants, vibration–rotational constants and bond lengths were obtained : B₀= 20.03586 ± 0.0005 cm^–1; 10²D₀= 0.499 ± 0.004 cm^–1; 10⁶H₀= 1.2 ± 0.8 cm^–1; α= 0.5856 ± 0.0002 cm^–1; 10³β=–0.294 ± 0.007 cm^–1; B_e= 20.3314 ± 0.0006 cm^–1; 10²D_e= 0.514 ± 0.004 cm^–1; r₀= 74.691 ± 0.002 pm; r₁= 75.806 ± 0.003 pm; r_e= 74.151 ± 0.002 pm. The r_e values for ³H₂ are compared with those of ¹H₂, ¹H²H and ²H₂.