HSCO+ and DSCO+: a multi-technique approach in the laboratory for the spectroscopy of interstellar ions

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Table 2.

Spectroscopic parameters derived for DSCO⁺.

Parameter	Unit	This work	Previous^a	ab initio^b
A	MHz	45158.6(22)	–	45002.7
B	MHz	618.1838(19)	5509.6970(20)^c	5619.3
C	MHz	401.1678(19)	5509.6970(20)^c	5402.3
D_J	kHz	1.42281(27)	12.00(10)^c	.387
D_JK	kHz	132.643(86)	–	132
D_K	MHz	3.951^d	–	.951
d₁	kHz	−0.05913(48)	–	−0.05318
d₂	kHz	−0.01525(11)	–	−0.01302
H_JK	Hz	0.439(52)	–	–
H_KJ	Hz	−42.68(81)	–	–
# lines		53
σ_rms	kHz	23
σ_w^e		0.74

Notes. Values in parentheses represent 1σ uncertainties, expressed in units of the last quoted digit.

^(a)

McCarthy & Thaddeus (2007).

^(b)

Fortenberry et al. (2012).

^(c)

The actual parameters fitted in McCarthy & Thaddeus (2007) are B_eff = (B + C)/2 and D_eff = D_J + (B − C)²/{32[A − (B + C)/2]}, assuming D_J = 1kHz.

^(d)

Fixed to the ab initio value.

^(e)

Dimensionless rms, defined as , where the δ’s are the residuals weighted by the experimental uncertainty (err) and N the total number of transitions analysed.

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