78 K (-195 °C). Avaraged data for samples containing 37, 33, and 6 wt% gallium (optical constants of the three samples are close to one another).
A. I. Golovashkin, I. S. Levchenko and G. P. Motulevich. Optical properties and electron characteristics of vanadium-gallium alloys obtained by evaporation in vacuum, Sov. Phys. JETP 30, 44-48 (1970)