Pressure broadening of deuterium hydride lines in the 5-0 vibrational band between 77 and 295 K

Self-braodening measurements have been made for the R(0) and R(1) lines of the 5-0 the vibration-rotation band of deuterium hydride. Pressure broadening coefficients and temperature-dependence indices have been determined from measurements over the temperature range of 77 to 295 K. A temperature-dependent index, n, of 0.31 was derived for the HD lines studied. A provisional temperature-dependence index for H 2 vibrational-rotational line broadening as small or smaller that the HD index is suggested. A small temperature-dependence index significantly reduces the derived H 2 abundances in the outer planets and correspondingly increases the D/H ratios.