The chemistry of ions in the Orion Bar I. – CH+, SH+, and CF+ - The effect of high electron density and vibrationally excited H2 in a warm PDR surface

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Volume 550 (February 2013)

A&A, 550 (2013) A96

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Table 1

Spectroscopic and observational parameters of the transitions used in this paper.

Transition	Frequency	E _up	A	Instrument/band	Beam-size	η _mb
	(MHz)	(K)	(s^-1)		(″)

CH⁺ 1−0	835 137.5	40.1	6.36 × 10^-3	HIFI, band 3a	26.5	0.75
CH⁺ 2−1	1 669 281.3	120.2	6.10 × 10^-2	HIFI, band 6b	15.0	0.72
CH⁺ 3−2	2 501 440.5	240.2	2.20 × 10^-1	PACS	9.4¹
CH⁺ 4−3	3 330 629.7	400.1	5.38 × 10^-1	PACS	9.4¹
CH⁺ 5−4	4 155 872.0	599.5	1.07	PACS	9.4¹
CH⁺ 6−5	4 976 201.4	838.3	1.86	PACS	9.4¹

¹³CH⁺ 1−0	830216.1	39.9	5.83 × 10^-3	HIFI, band 3a	26.5	0.75

SH⁺N_J = 1₂−0₁, F = 3/2−1/2	526 038.7	25.3	7.99 × 10^-4	HIFI, band 1a	44.2	0.76
SH⁺N_J = 1₂−0₁, F = 5/2−3/2	526 047.9	25.3	9.59 × 10^-4	HIFI, band 1a	44.2	0.76
SH⁺N_J = 1₂−0₁, F = 3/2−3/2	526 124.9	25.3	1.60 × 10^-4	HIFI, band 1a	44.2	0.76
SH⁺N_J = 1₁−0₁, F = 3/2−1/2	683 336.1	32.8	2.90 × 10^-4	HIFI, band 2a	33.2	0.75
SH⁺N_J = 1₁−0₁, F = 1/2−1/2	683 362.0	32.8	1.16 × 10^-3	HIFI, band 2a	33.2	0.75
SH⁺N_J = 1₁−0₁, F = 3/2−3/2	683 422.3	32.8	1.45 × 10^-3	HIFI, band 2a	33.2	0.75
SH⁺N_J = 1₁−0₁, F = 1/2−3/2	683 448.2	32.8	5.79 × 10^-4	HIFI, band 2a	33.2	0.75

CF⁺ 5–4	512 846.5	73.8	8.21 × 10^-4	HIFI, band 1a	44.2	0.76
CF⁺ 6–5	615 365.6	103.4	1.44 × 10^-3	HIFI, band 1b	44.2	0.76

¹³CF⁺ 5–4	488 664.3	70.0	7.10 × 10^-4	HIFI, band 1a	44.2	0.76

Notes.

⁽¹⁾

The size of one PACS spaxel.

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