reciprocal latice spacings for ice (hexagonal, a=b= 4.5212, c=7.3666 Å) Sorted by resolution (Cubic ice ice Ic has spacings 3.68 and 2.26) n h k l d(Å) 1 0 0 1 7.367 - absent 2 1 0 0 3.915 3 0 0 2 3.683 4 1 0 1 3.457 5 1 0 2 2.683 6 0 0 3 2.456 - absent 7 1 1 0 2.261 8 1 1 1 2.161 9 1 0 3 2.080 10 2 0 0 1.958 11 1 1 2 1.927 12 2 0 1 1.892 13 0 0 4 1.842 14 2 0 2 1.729 15 1 0 4 1.667 16 1 1 3 1.663 17 2 0 3 1.531 18 2 1 0 1.480 19 2 1 1 1.451 20 1 1 4 1.428 21 2 1 2 1.373 22 2 0 4 1.341 23 3 0 0 1.305 24 3 0 1 1.285 25 2 1 3 1.268 26 3 0 2 1.230 27 2 1 4 1.154 28 3 0 3 1.152 29 2 2 0 1.130 30 2 2 1 1.117 31 3 1 0 1.086 32 2 2 2 1.081 33 3 1 1 1.074 34 3 0 4 1.065 35 3 1 2 1.042 36 2 2 3 1.027 37 3 1 3 0.993 38 2 2 4 0.963 39 3 1 4 0.935 40 3 2 0 0.898 41 3 2 1 0.892 42 3 2 2 0.873 43 3 2 3 0.844 44 3 2 4 0.807 45 3 3 0 0.754 46 3 3 1 0.750 47 3 3 2 0.738 48 3 3 3 0.720 49 3 3 4 0.697