Average atomic weight: 18.998403163(6) u
| Isotope | Fraction | Atomic weight/u |
| 19 | 1(0) | 18.99840316273(92) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
F I (F -like): 132 levels, 2125 lines (E1: 948 IC: 1165 M1: 3 E2: 4 M2: 5), transition probabilities for 1091 lines
F II (O -like): 278 levels, 8451 lines (E1: 4476 IC: 3963 M1: 5 E2: 7), transition probabilities for 2082 lines
F III (N -like): 277 levels, 8042 lines (E1: 4900 IC: 3125 M1: 8 E2: 9), transition probabilities for 2727 lines
F IV (C -like): 149 levels, 2275 lines (E1: 1395 IC: 868 M1: 5 E2: 7), transition probabilities for 1449 lines
F V (B -like): 117 levels, 1276 lines (E1: 1218 IC: 51 M1: 3 E2: 4), transition probabilities for 1152 lines
F VI (Be-like): 255 levels, 3282 lines (E1: 3233 IC: 44 M1: 2 E2: 2 M2: 1), transition probabilities for 2371 lines
F VII (Li-like): 55 levels, 410 lines (E1: 410), transition probabilities for 410 lines
F VIII (He-like): 122 levels, 1207 lines (E1: 1197 IC: 9 M2: 1), transition probabilities for 941 lines
F IX (H -like): 380 levels, 6310 lines (E1: 6310), transition probabilities for 6310 lines
(Atomic Line List v3.00b5)
