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Table 1

Spectroscopic parameters of HC3HCN (all in MHz).

Parameter Experimental Theoretical
A 29 173.01440(72) (a) 27 909 (b)
B 2807.94534(25) 2835 (b)
C 2556.92917(25) 2574 (b)
ΔN 0.0014120(19) 0.0014 (c)
ΔNK −0.109826(50) −0.091 (c)
δN 0.0003574(45) 0.000345 (c)
εaa −60.5224(30) −51.35 (c)
εbb −5.3817(12) −6.385 (c)
εcc −0.5405(13) −1.60 (c)
εab ∓1.214(73)(d) ∓1.64 (c)
−32.2969(32) −31.70 (e)
8.7599(36) 9.14 (e)
−7.9786(61) −8.43 (e)
±12.58(20)(d) ±13.55 (e)
−51.3475(46) −55.10 (e)
−25.3318(27) −29.31 (e)
24.5181(48) 28.42 (e)
[±0.79](f) ±0.79 (e)
6.6999(27) 1.1852 (e)
−10.3977(22) −11.33 (e)
−9.1827(48) −9.51 (e)
[±1.72] ±1.72 (e)
−2.7743(22) −2.82 (e)
0.6098(42) 0.57 (e)
[±2.70] ±2.70 (e)

a | 3.70 (b,g)
b | 1.77 (b,g)

Notes. (a) Numbers in parentheses are 1σ uncertainties in units of the last digits. (b)RCCSD(T)/cc-pCVQZ. (c) MP2/cc-pVTZ. (d) Only the relative signs are determined. (e)QCISD/cc-pVTZ. (f) Values in brackets were fixed to the theoretical values. (g)In units of Debye.

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