Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M)

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Volume 521 (October 2010)

A&A, 521 (2010) L11

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Herschel/HIFI: first science highlights

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Table A.1:

Quantum numbers of rotational transitions of H₂O⁺ described in the present work, calculated frequencies (MHz) with uncertainties in parentheses^a; lower state energies $E_{\rm lo}$ (K) and Einstein A-values (10^-3 s^-1)
N'_{K_a'K_c'} - N''_{K_a''K_c''}
J' - J''	F' - F''	frequency		$E_{\rm lo}$	A
1₁₀-1₀₁, para
1.5-0.5	b	604678	.6 (25)	0.005	1.3
1.5-1.5	b	607227	.3 (19)	0.000	6.2
0.5-0.5	b	631724	.1 (37)	0.005	5.6
0.5-1.5	b	634272	.9 (24)	0.000	2.8
1₁₁-0₀₀, ortho
1.5-0.5	1.5-0.5	1115150	.75 (85)	0.122	17.1
1.5-0.5	0.5-0.5	1115186	.18 (81)	0.122	27.5
1.5-0.5	2.5-1.5	1115204	.15 (82)	0.000	31.0
1.5-0.5	1.5-1.5	1115262	.90 (82)	0.000	13.9
1.5-0.5	0.5-1.5	1115298	.33 (87)	0.000	3.5
0.5-0.5	0.5-0.5	1139541	.54 (103)	0.122	3.7
0.5-0.5	1.5-0.5	1139560	.58 (94)	0.122	14.8
0.5-0.5	0.5-1.5	1139653	.69 (94)	0.000	29.4
0.5-0.5	1.5-1.5	1139672	.73 (103)	0.000	18.3

Notes. ^(a) Numbers in parentheses are 1 $\sigma$ uncertainties in units of the least significant figures. These values should be viewed with some caution, in particular for the para transition, see text. ^(b) F is redundant for para transitions; F = J may be assumed. The lowest para state is 30.01 K above the lowest ortho state.

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