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| Measured | Calculated | ||
| J = 1-0 | J = 1-0 | J = 2-1 | |
| CH+ | 835 137.504 (20) | 835 137.503 (20) | 1 669 281.3 (3) |
| 13CH+ | 830 216.095 (30)b | 830 216.096 (22) | 1 659 450.3 (3) |
| CD+ | 453 521.851 (20) | 453 521.851 (20) | 906 752.0 (1) |
| 13CD+ | 448 539.258 (26) | 896 793.2 (1) | |
| 14CH+ | 826 012.748 (45) | 1 651 053.6 (3) | |
| CT+ | 325 443.364 (70) | 650 736.8 (1) | |
Notes. (a) Numbers in parentheses are one standard deviation in units of the least significant figures; see the text for discussion of uncertainties. (b) Value corrected for hyperfine splitting; two lines were measured, see text, each accurate to 30 kHz.
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