First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)

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Table 2

Spectroscopic parameters of CHD₂CCH and CH₂DCCD.

Parameter	CHD₂CCH	CH₂DCCD
A₀ (MHz)	95746(533)	119688.0(170)
B₀ (MHz)	7765.71927(255)	7440.77759(341)
C₀ (MHz)	7630.99013(254)	7332.00345(340)
Δ_J (kHz)	2.3807(270)	2.0759(347)
Δ_JK (kHz)	123.83(224)	118.93(295)

N^(a)	16	17
rms (kHz) ^(b)	52	80

Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits. ^(a)Number of lines included in the fit. For CHD₂CCH, J_max = 7, K_max = 2, and ν_max = 108.241 GHz, and for CH₂DCCD, J_max = 7, K_max = 2, and ν_max = 103.784 GHz. ^(b) Root mean square of the fit.

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