FITTING LAW FOR THE DENSITY SHIFT OF Q(J) TRANSITIONS OF H2 IN H2–X (X: H2, He, N2) MIXTURES

Abstract A variety of fitting laws have been developed for the purpose of modelling broadening effects in collisional processes, but only a few have been proposed for modelling collision-induced lineshifts in molecules. We analysed accurate stimulated Raman data obtained in several H2–X mixtures (X: H2, He and N2). For the first time, we show that an empirical law provides a very good representation of collisional lineshift coefficients in the range 300–1200 K and for J quantum number up to 9.