The libron spectra and conversion as a function of ortho-para concentration in solid H2and D2

✍ Scribed by Piet J. Berkhout; J. Th. Minneboo; Isaac F. Silvera

• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 628 KB
• Volume: 32
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00117960

✦ Synopsis

A study of the Raman scattering spectra of orientationally ordered ortho-H2 and para-De as a function of J = 0 impurities is presented. Libron peak frequencies over the concentration region 0.75<Cl < 0.98 are determined and show a linear concentration dependence that can be represented by the relation fox(c1 ) = toA( 1)[I -K~ (1 -Cl)]. A least squares fit of our data gives values of KA = 1.27+0.05, 1.28+0.05, and 0.96+0.05 in D2 where A = E s, T~ 1), and T~ 2), respectively, and K~ = 1.32 + O.05and 0.97+ O.05forthe Eg and T~ ) modes in He. Results are compared to the values calculated by Diehl et al. using the coherent potential approximation for the J = 0 impurity problem. Extrapolated values for wx (1) were obtained that are slightly higher than those given by Hardy, Silvera, and McTague, resulting in an increased value for the effective interaction parameter Fe~. Conversion rates for He and D2 are determined, resulting in knz=O.O193+O.OOO7h -1 and ko2 = O. 00063 + O.