The J=0{minus}>2 Raman signal from solid J=0 D{sub 2} or H{sub 2} reveals HCP structure when deposited at a rate 0.1 {le} R({mu}/min) {le} 40 onto MgF{sub 2} at T{sub d}/T{sub tp} > 0.3, a mixture of HCP and FCC crystals at 0.2 < T{sub d}/T{sub tp} < 0.3 and possibly a randomly stacked close packed structure at T{sub d}/T{sub tp} < 0.2, where T{sub tp} is the triple point temperature. Non-HCP crystals transform to HCP continuously and irreversibly with increasing T. Finally, the crystal size decreases with decreasing T{sub d} and increasing R, from {approximately} 1 mm at T{sub d} {approximately} 0.8 T{sub tp} and R {approximately} 2 {mu}/min to {approximately} 1 {mu}m at 0.25 T{sub tp} and R {approximately} 40 {mu}/min
