Figure 49: Effect of value on HFD shape extracted from 4.2 K Mössbauer spectrum for small Fe particles. (a) 0.05 T ( = 0, = 33.3 T, l = 0.36 mms−1; HR = 0.8414, = 1.099); (b) = 0.15 T ( = 0, = 30.3 T, l = 0.34 mms−1; HR = 0.8204, = 1.071); (c) = 0.5 T ( = 0, = 22.0 T, l = 0.33 mms−1; HR = 0.7795, = 1.012); (d) = 0.8 T ( = 0, = 15.0 T, l = 0.31 mms−1; HR = 0.7593, ).