Checkpoint
which two layer-lines (LL) were used?
Note, there may be multiple acceptable answers to this question. Format: LL (R, Z)
LL (36, 30)
LL (23, 156)
Hint: LL (27, 186) = LL (36, 30) + LL (23, 156).
The distance of LL(27, 186) to meridian is between LL(36,30) and LL(23,156). This suggests LL (36, 30) is probably has a different hand to LL (23, 156)
What are the possible Bessel order ranges for those two vectors?
LL (36, 30)
:
2*π*R*rmax = 2 * 3.14 * (36/640/1.12) * 30 = 9.4 Bessel order n ≤ 8
LL (23, 156):
2*π*R*rmax = 2 * 3.14 * (23/640/1.12) * 30 = 6.0 Bessel order n ≤ 5
What are the possible symmetries?
What's the correct symmetry (quickly check whether it is in your list)
point group: C3
helical rise: 2.10 Å
helical twist: -54.7 degrees