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Table 2:

Derived spectroscopic parametersa (cm-1, MHz, unitless) of methylidynium, 12CH+ in its $X\ ^1\Sigma ^+$ and $A\ ^1\Pi $ electronic states from a global fit involving four isotopologs.
Parameter Value

$X\ ^1\Sigma ^+$
Y10 2 857.569 2 (92)
${\it\Delta} ^{\rm C} _{10}$ -1.120 (137)
${\it\Delta} ^{\rm H} _{10}$ -1.715 9 (86)
Y20 -59.318 7 (60)
${\it\Delta} ^{\rm H} _{20}$ -1.578 (188)
Y01 425 058.66 (248)
${\it\Delta} ^{\rm C} _{01}$ -7.974 9 (105)
${\it\Delta} ^{\rm H} _{01}$ -9.226 3 (76)
Y11 -14 859.0 (67)
${\it\Delta} ^{\rm H} _{11}$ -7.222 (33)
Y02 -41.905 (20)
${\it\Delta} ^{\rm H} _{02}$ -24.36 (86)

$A\ ^1\Pi $
T(H)b 23 619.707 (5)
T(D)b 23 760.102 (5)
Y10(H) 1 864.485 (8)
${\it\Delta} ^{\rm C} _{10}$(H) 1.244 (145)
Y10(D) 1 367.294 (8)
${\it\Delta} ^{\rm C} _{10}$(D) -2.876 (306)
Y01 356 391.8 (29)
${\it\Delta} ^{\rm C} _{01}$ -0.56 (33)
${\it\Delta} ^{\rm H} _{01}$ -1.630 (12)
Y11 -27 538.7 (71)
${\it\Delta} ^{\rm H} _{11}$ -1.604 (98)

Notes. (a) The electronic term values T, and the vibrational parameters Yi0 are given in cm-1; all other Yij are given in MHz; the ${\it\Delta} ^{\rm X} _{ij}$ are unitless. Numbers in parentheses are one standard deviation in units of the least significant figures. (b) Determined with respect to the lowest allowed energy levels of each electronic state.


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