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

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Table 1.

Spectroscopic parameters derived for HSCO⁺.

Parameter	Unit	This work	Previous^a	ab initio^b	HSCN^c
A	MHz	79431.995(10)	–	79236.6	289 737(64)
B	MHz	696.74645(86)	5636.8660(20)^d	697.6	794.71368(20)
C	MHz	576.97793(66)	5636.8660(20)^d	577.6	674.93940(20)
D_J	kHz	1.51961(25)	3.10(10)^d	1.481	1.66557(21)
D_JK	kHz	136.393(93)	–	137	151.53(11)
D_K	MHz	5.654^e	–	5.654	–
d₁	Hz	−34.03(17)	–	−30.14	−35.91(21)
d₂	Hz	−4.720(85)	–	−3.829	−5.17(31)
H_JK	Hz	0.320(49)	–	0.361	0.518(26)
H_KJ	Hz	−176.9(10)	–	−180.366	−170.3(86)
H_K	kHz	0.64769^e	–	0.64769	–
# lines		63
σ_rms	kHz	41
σ_w^f		1.19

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)

Brünken et al. (2009).

^(d)

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 = 1 kHz.

^(e)

Fixed to the ab initio value.

^(f)

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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