A spectroscopic survey of Orion KL between 41.5 and 50 GHz

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Table 2

Line list.

Observed	Species	Rest	Transition	E_upp	A_ul
Freq. (MHz)		Freq. (MHz)	J _{K _a, K _c}	(K)	× 10^-6 (s^-1)

41 573.1	AA-CH₃OCH₃	41 573.290	19_5,14–18_6,13	208.3	0.07
41 575.3	EE-CH₃OCH₃	41 575.465	19_5,14–18_6,13	208.3	0.06
41 607.1	H90ϵ	41 605.242
41 616.2	H100η	41 613.994
	CH₃NH₂	41 615.387	15_1,4–15_0,5	256.9	0.86
41 702.7	H108ι	41 700.798
41 848.5	H67β	41 846.551
41 859.7	³³SO₂	41 859.643	6_2,4–7_1,7	29.0	0.14
41 865.4	He67β	41 863.603
41 867.2	C67β	41 867.430
41 878.8	H104θ	41 877.388
41 904.6	A-¹³CH₃OH	41 904.330	8_2,7–9_1,8	119.3	0.31
42 003.2	H95ζ	42 000.640
42 038.2	A-CH₃OH ν_t = 1	42 038.245	22_9,1–22_8,−1	1268.9	0.09
42 285.2	E-CH₃OH ν_t = 1	42 284.886	J_K = 19_-3–18_-2	762.1	0.09
42 288.9	H111κ	42 287.291
42 369.3	EE-CH₃OCH₃	42 368.723	13_3,11–12_4,8	95.6	0.07
42 372.9	³⁰SiO	42 373.424	J = 1–0	2.0	2.83
42 374.5	³⁰SiO	42 373.424	J = 1–0	2.0	2.83
42 386.6	NH₂CHO	42 386.062	2_0,2–1_0,1	3.1	4.64
42 416.0	H76γ	42 414.088
42 432.7	He76γ	42 431.374
42 451.3	AA-CH₃OCH₃	42 450.801	16_4,13–15_5,10	146.5	0.07
42 453.5	EE-CH₃OCH₃	42 453.197	16_4,13–15_5,10	146.5	0.07
42 571.4	H114λ	42 569.587
42 602.2	HC₅N	42 602.153	J = 16–15	17.4	8.18
42 673.9	HCS⁺	42 674.195	J = 1–0	2.0	1.16
42 675.3	CH₃CH₂CN	42 674.211	11_1,10–11_0,11	30.2	0.47
42 734.0	U
42 804.5	U
42 808.0	U
42 818.9	SiO v = 2	42 820.586	J = 1–0	3523.4	3.00
42 821.8	SiO v = 2	42 820.586	J = 1–0	3523.4	3.00
42 846.7	H99η	42 845.810
42 881.2	H83δ	42 879.802
	²⁹SiO	42 879.947	J = 1–0	2.1	2.94
42 953.7	H53α	42 951.968
42 971.2	He53α	42 969.471
42 973.3	C53α	42 973.396
42 987.7	H89ϵ	42 985.692
43 016.4	SO₂	43 016.275	19_2,18–18_3,15	182.6	0.12
43 042.4	NH₂D	43 042.276	3_1,3–3_0,3ν = 1–0	94.5	1.34
43 066.8	H103θ	43 064.750
43 120.7	SiO v = 1	43 122.073	J = 1–0	1771.3	3.02
43 123.6	SiO v = 1	43 122.073	J = 1–0	1771.3	3.02
43 178.6	SO₂	43 178.167	23_2,22-22_3,19	259.9	0.08
43 289.5	AA-CH₃COCH₃	43 289.395	13_10,3-13_9,4	77.8	2.10
43 317.0	H94ζ	43 314.754
43 397.6	O-CH₂OCH₂	43 397.471	8_6,2–8_5,3	78.3	1.25
43 404.2	H110κ	43 402.880
43 423.2	SiO	43 423.852	J = 1–0	2.1	3.05
43 425.3	SiO	43 423.852	J = 1–0	2.1	3.05
43 447.4	AE-CH₃OCH₃	43 446.471	6_1,5–6_0,6	21.1	0.51
	EA-CH₃OCH₃	43 446.471	6_1,5–6_0,6	21.1	0.51
	EE-CH₃OCH₃	43 447.541	6_1,5–6_0,6	21.1	0.51
	AA-CH₃OCH₃	43 448.612	6_1,5–6_0,6	21.1	0.51
43 517.0	CH₃CH₂CN	43 516.196	5_1,5–4_1,4	7.4	6.20
43 564.6	CH₃CH₂CN ν₁₃/ν₂₁	43 563.724	5_1,5–4_1,4ν = 3–3	313.5	11.1
	CH₃CH₂CN ν₁₃/ν₂₁	43 563.927	5_1,4–4_1,3ν = 5–5	313.5	11.1
43 607.8	CH₃CH₂CN ν₁₃/ν₂₁	43 606.667	5_1,5–4_1,4ν = 0–0	304.4	11.3
	CH₃CH₂CN ν₁₃/ν₂₁	43 606.681	5_1,4–4_1,3ν = 2–2	304.4	11.3
43 620.1	³⁴SO₂	43 619.944	9_3,7–10_2,8	62.6	0.19
43 689.7	EE-CH₃OCH₃	43 689.344	16_4,12-15_5,11	146 .5	0.08
43 750.7	H66β	43 748 .951
43 768.8	He66β	43 766.779
	C66β	43 770.779
43 798.9	HNCO	43 799.014	2_1,2–1_1,1	46.4	0.74
43 829.4	E-CH₃OCOH	43 829.202	9_−2,7–9_−1,8	29.6	0.17
43 845 .0	EE-CH₃COCH₃	43 844.921	18_11,7–18_10,8	139.3	2.95
43 851.6	A-CH₃OCOH	43 851.298	9_2,7–9_1,8	30.2	0.17
43 894.9	U
43 907.3	U
43 954.7	NH₂CHO	43 954.458	2_1,1–1_1,0	6.1	3.88
43 963.0	HNCO	43 963.039	2_0,2–1_0,1	3.2	1.02
44 013.4	H106ι	44 011.477
44 053.0	SO₂	44 052.873	6_2,4–7_1,7	29.2	0.16
44 069.1	A-CH₃OH	44 069.367	7_0,1–6_1,1	65.0	0.20
44 084.0	H¹³CCCN	44 084.162	J = 5–4	6.3	0.63
44 101.5	H75γ	44 100.093
44 120.3	HNCO	44 119.876	2_1,1–1_1,0	46.5	0.76
	He75γ	44 118.066
44 127.7	H98η	44 126.746
44 226.1	³⁴SO₂	44 226.222	10_3,7–11_2,10	71.9	0.19
44 294.7	E-¹³CH₃OH	44 294.420	10_−1,10–9_−2,8	122.2	0.12
44 299.8	H102θ	44 297.448
44 431.8	H82δ	44 430.706
	H88ϵ	44 427.913
44 531.5	EE-CH₃COCH₃	44 531.376	14_8,6–14_7,7	84.7	2.62
44 560.2	H109κ	44 558.084
44 597.8	CH₃CH₂CN	44 596.990	5_0,5–4_0,4	6.4	6.95
44 631.0	CH₃CH₂CN ν₁₃/ν₂₁	44 630.164	5_0,5–4_0,4ν = 3–3	312.5	12.5
	CH₃CH₂CN ν₁₃/ν₂₁	44 630.42 6	5_0,5–4_0,4ν = 5–5	312.5	12.5
44 661.6	CH₃CH₂CN ν₁₃/ν₂₁	44 660.925	5_0,5–4_0,4ν = 2–2	303.5	12.6
	CH₃CH₂CN ν₁₃/ν₂₁	44 660.940	5_0,5–4_0,4ν = 0–0	303.5	12.6
44 686.3	H93ζ	44 684.278
44 730.5	CH₃CH₂CN	44 730.269	5_2,4–4_2,3	10.9	5.90
44 769.7	CH₃CH₂CN	44 768.914	5_4,2–4_4,1	24.2	2.53
	CH₃CH₂CN	44 768.918	5_4,1–4_4,0	24.2	2.53
44 776.0	CH₃CH₂CN	44 775.379	5_3,2–4_3,1	16.5	4.51
44 789.8	H112λ	44 787.091
44 793.5	CH₃CH₂CN ν₁₃/ν₂₁	44 792.650	5_1,5–4_1,4ν = 1–1	307.6	10.6
	CH₃CH₂CN ν₁₃/ν₂₁	44 792.678	5_2,4–4_2,3ν = 0–0	307.6	10.6
	CH₃CH₂CN ν₁₃/ν₂₁	44 794.103	5_3,3–4_3,2ν = 3–3	323.4	7.88
	CH₃CH₂CN ν₁₃/ν₂₁	44 794.847	5_3,3–4_3,2ν = 4–4	323.4	7.88
	CH₃CH₂CN ν₁₃/ν₂₁	44 795.002	5_3,2–4_3,1ν = 5–5	323.4	7.88
	CH₃CH₂CN ν₁₃/ν₂₁	44 795.284	5_3,2–4_3,1ν = 3–3	323.4	7.88
44 832.3	CH₃CH₂CN ν₁₃/ν₂₁	44 830.148	5_3,3–4_3,2ν = 1–1	312.8	7.64
	CH₃CH₂CN ν₁₃/ν₂₁	44 830.257	5_3,2–4_3,1ν = 0–0	312.8	7.99
	CH₃CH₂CN ν₁₃/ν₂₁	44 831.290	5_4,2–4_4,1ν = 1–1	320.0	4.44
	CH₃CH₂CN ν₁₃/ν₂₁	44 831.336	5_4,1–4_4,0ν = 2–2	320.0	4.44
	CH₃CH₂CN ν₁₃/ν₂₁	44 831.357	5_4,2–4_4,1ν = 0–0	320.0	4.23
	CH₃CH₂CN ν₁₃/ν₂₁	44 831.365	5_4,1–4_4,0ν = 0–0	320.0	4.23
44 878.6	CH₃CH₂CN	44 878.102	5_2,3–2_2,2	10.9	5.95
44 956.1	E-CH₃OH ν_t = 1	44 955.794	J_K = 2₀–3₁	307.5	0.38
45 071.4	A-CH₃OCOH ν_t = 1	45 071.299	4_1,4–3_1,3	194.5	1.17
45 102.9	U
45 221.1	E-CH₃OCOH ν_t = 1	45 221.427	4_1,4–3_1,3	193.7	1.19
45 233.5	H105ι	45 231.074
	EE-CH₃COCH₃	45 233.560	3_2,2–2_1,1	4.5	2.20
45 264.7	HC₅N	45 264.720	J = 17–16	19.6	9.83
45 297.1	HC¹³CCN	45 297.335	J = 5–4	6.5	6.85
45 301.9	HCC¹³CN	45 301.707	J = 5–4	6.5	6.85
45 306.6	EE-CH₃COCH₃	45 306.662	9_4,5–9_3,6	34.6	2.03
45 325.4	CH₃NH₂	45 324.879	14_1,4–14_0,5	225.4	1.08
45 379.5	CCS	45 379.027	N_J = 3₄–2₃	5.4	3.91
45 395.6	E-CH₃OCOH	45 395.802	4_1,4–3_1,3	5.5	1.20
45 397.8	A-CH₃OCOH	45 397.360	4_1,4–3_1,3	6.1	1.20
45 455.5	H52α	45 453.719
45 474.3	He52α	45 472.241
45 478.3	C52α	45 476.395
45 490.1	HC₃N	45 490.311	J = 5–4	6.5	6.94
45 565.8	HC₃N ν₆ = 1	45 564.962	J_L = 5_-1-4_-1	724.3	4.80
45 579.4	H101θ	45 577.669
45 602.8	HC₃N ν₇ = 1	45 602.171	J_L = 5_-1–4_-1	326.6	6.67
	HC₃N ν₆ = 1	45 600.785	J_L = 5₁–4₁	724.3	4.80
45 668.0	HC₃N ν₇ = 1	45 667.549	J_L = 5₁–4₁	326.6	6.70
45 758.5	H108κ	45 754.676
45 770.4	H65β	45 768.445
45 781.5	HC₃N ν₇ = 2	45 778.894	J_L = 5_-2–4_-2	652.5	5.88
	HC₃N ν₇ = 2	45 779.070	J_L = 5₀–4₀	649.3	7.00
	HC₃N ν₇ = 2	45 779.197	J_L = 5₂–4₂	652.5	5.88
	U
45 788.8	He65β	45 787.095
45 818.2	A-CH₃OH	45 818.114	10_1,−1–10_1,1	143.3	0.008
	U
45 843.8	E-CH₃OH	45 843.554	J_K = 9₃–10₂	144.3	0.16
45 879.0	H74γ	45 876.667
45 897.6	He74γ	45 895.364
45 910.5	CH₃CH₂CN	45 909.515	5_1,4–4_1,3	7.7	7.28
45 920.6	EE-CH₃COCH₃	45 920.479	12_9,4–12_8,5	65.9	2.32
	o-H₂¹³CO	45 920.058	4_1,3–4_1,4	31.9	0.31
45 923.8	CH₃CH₂CN ν₁₃/ν₂₁	45 922.352	5_1,4–4_1,3ν = 3–3	313.8	13.0
	CH₃CH₂CN ν₁₃/ν₂₁	45 922.766	5_1,5–4_1,4ν = 4–4	313.8	13.0
45 937.5	H87ϵ	45 935.392
46 016.7	A-CH₃OCOH	46 017.032	7_1,6–7_0,7	17.9	0.11
46 059.5	H81δ	46 057.331
46 077.5	He81δ	46 076.099
46 115.6	H92ζ	46 112.177
46 225.2	U
46 245.3	C₃S	46 245.623	J = 8–7	10.0	0.74
46 247.5	¹³CS	46 247.563	J = 1–0	2.2	1.47
46 251.1	EE-CH₃COCH₃	46 251.002	11_7,5–11_6,6	53.1	2.56
46 267.1	CH₂CHCN	46 266.935	5_1,5–4_1,4	8.8	7.34
46 346.9	U
46 387.9	U
46 476.5	U
46 484.9	U
46 552.9	EE-CH₃COCH₃	46 552.825	8_3,5–8_2,6	26.7	1.88
	U
46 855.5	CH₃CH₂CN	46 855.211	12_1,11–12_0,12	35.4	0.58
46 955.6	EE-CH₃COCH₃	46 955.561	12_8,5–12_7,6	63.7	2.79
46 997.5	H107κ	46 994.530
47 002.7	³⁴SO₂	47 002.372	21_3,19–20_4,16	233.5	0.23
47 087.5	U
47 089.7	U
47 095.0	p-CH₂OCH₂	47 094.971	4_4,1–4_3,2	21.5	0.75
47 157.2	A-CH₃OCOH ν_t = 1	47 157.098	4_0,4–3_0,3	194.1	1.42
47 205.4	A-¹³CH₃OH	47 205.210	1_0,1–0_0,0	2.3	0.27
47 209.8	E-¹³CH₃OH	47 209.550	1_0,1–0_0,0	7.5	0.27
47 249.3	E-CH₃OCOH ν_t = 1	47 249.447	4_0,4–3_0,3	193.3	1.43
47 277.1	U
47 293.7	³⁴SO₂	47 293.169	21_2,20–20_3,17	218.6	0.12
47 355.0	CH₂CHCN	47 354.650	5_0,5–4_0,4	6.8	8.20
47 374.7	AA-CH₃OCH₃	47 374.428	13_3,10–12_4,9	95.8	1.05
47 378.3	EE-CH₃OCH₃	47 377.890	13_3,10–12_4,9	95.8	1.05
47 381.5	AE-CH₃OCH₃	47 381.058	13_3,10–12_4,9	95.8	1.05
	EA-CH₃OCH₃	47 381.643	13_3,10–12_4,9	95.8	1.05
47 420.4	CH₂CHCN	47 419.796	5_2,4–4_2,3	15.5	6.92
47 445.0	CH₂CHCN	47 443.883	5_3,2–4_3,1	26.3	5.28
47 549.6	U
47 462.4	OC³⁴S	47 462.353	J = 4–3	5.7	0.28
47 490.2	CH₂CHCN	47 489.231	5_2,3–4_2,2	15.5	6.95
47 513.8	H86ϵ	47 511.871
47 534.3	E-CH₃OCOH	47 534.116	4_0,4–3_0,3	5.2	1.46
47 537.1	A-CH₃OCOH	47 536.905	4_0,4–3_0,3	5.8	1.46
47 557.0	p-CH₂OCH₂	47 556.913	5_5,0–5_4,1	33.5	0.75
47 603.2	H91ζ	47 601.583
47 658.9	U
47 661.0	SO₂	47 660.621	31_5,27–30_6,24	519.0	0.26
47 675.0	EA-CH₃OCH₃	47 674.049	1_1,1–0_0,0	2.3	0.56
	AE-CH₃OCH₃	47 674.066	1_1,1–0_0,0	2.3	0.56
	EE-CH₃OCH₃	47 674.958	1_1,1–0_0,0	2.3	0.56
	AA-CH₃OCH₃	47 675.858	1_1,1–0_0,0	2.3	0.56
47 752.4	H73γ	47 749.977
47 766.4	H80δ	47 764.347
47 785.9	He80δ	47 783.813
47 793.7	AA-CH₃OCH₃	47 793.664	9_1,9–8_2,6	40.9	0.07
47 796.5	EE-CH₃OCH₃	47 796.327	9_1,9–8_2,6	40.9	0.07
47 810.4	H103ι	47 808.933
47 913.6	SO₂	47 913.427	14_2,12–13_3,11	108.1	0.28
	H64β	47 914.182
47 927.2	HC₅N	47 927.274	J = 18–17	21.9	11.7
47 935.6	He64β	47 933.707
48 001.7	³³SO₂	48 002.505	10_3,7–11_2,10	72.3	0.25
48 071.9	E-CH₃OCOH	48 072.207	18_−4,14–18_4,15	113.8	0.10
48 120.9	SO₂	48 120.430	21_2,20-20_3,17	219.5	0.14
48 155.4	H51α	48 153.597
48 175.0	He51α	48 173.219
48 178.8	C51α	48 177.620
48 206.7	C³⁴S	48 206.942	J = 1–0	2.3	1.67
48 247.5	E-CH₃OH ν_t = 1	48 247.571	J_K = 1₀–0₀	302.9	0.35
48 257.2	A-CH₃OH ν_t = 1	48 257.310	1_0,1–0_0,1	426.0	0.35
48 284.4	o-H₂CO	48 284.513	4_1,3–4_1,4	32.7	0.36
48 291.8	H95η	48 289.787
	H99θ	48 290.070
48 372.4	A-CH₃OH	48 372.460	1_0,1–0_0,1	2.3	0.36
48 377.2	E-CH₃OH	48 376.887	J_K = 1₀–0₀	7.5	0.36
48 496.0	O¹³CS	48 495.061	J = 4–3	5.8	0.30
48 529.7	E-¹³CH₃OH	48 529.770	7_−2,6–8_−1,8	81.6	0.17
48 553.3	CH₂CHCN	48 552.564	5_1,4–4_1,3	9.2	8.49
48 586.0	C³³S	48 586.506	J = 1–0	2.3	1.71
48 589.0	EE-CH₃COCH₃	48 588.915	13_7,6–13_6,7	72.6	3.09
48 618.8	p-H₂CO	48 617.998	11_2,9–11_2,10	279.7	0.21
48 630.7	A-CH₃OCOH ν_t = 1	48 630.383	4_3,2–3_3,1	200.2	0.69
48 651.8	OCS	48 651.604	J = 4–3	5.8	0.30
48 670.2	A-CH₃OCOH ν_t = 1	48 669.924	4_3,1–3_3,0	200.2	0.69
48 708.3	E-CH₃OH ν_t = 1	48 708.074	J_K = 21₃–22₄	950.7	0.58
48 766.9	A-CH₃OCOH	48 766.974	4_2,3–3_2,2	8.5	1.19
48 768.4	E-CH₃OCOH	48 768.254	4_2,3–3_2,2	7.9	1.19
48 901.8	AE-CH₃OCH₃	48 900.278	7_1,6–7_0,7	27.6	0.68
	EA-CH₃OCH₃	48 900.278	7_1,6–7_0,7	27.6	0.68
	EE-CH₃OCH₃	48 901.416	7_1,6–7_0,7	27.6	0.68
	AA-CH₃OCH₃	48 902.554	7_1,6–7_0,7	27.6	0.68
48 991.1	CS	48 990.957	J = 1–0	2.4	1.75
49 001.3	o-CH₂OCH₂	49 000.973	3_2,2–3_1,3	11.8	0.73
	A-CH₃OCOH ν_t = 1	49 000.801	10_2,8–10_1,9	224.4	0.22
49 028.5	E-CH₃OCOH ν_t = 1	49 028.893	4_2,3–3_2,2	196.0	1.20
49 134.7	A-CH₃OCOH	49 134.613	4_3,2–3_3,1	11.9	0.71
49 151.5	E-CH₃OCOH	49 151.621	4_3,2–3_3,1	11.3	0.70
49 155.8	E-CH₃OCOH	49 155.295	4_−3,1–3_−3,0	11.3	0.70
49 158.2	H90ζ	49 155.858
49 163.1	H85ϵ	49 161.342
49 173.7	H102ι	49 171.605
49 180.0	A-CH₃OCOH	49 180.088	4_3,1–3_3,0	11.9	0.72
49 187.1	E-CH₃OCOH ν_t = 1	49 186.907	4_2,2–3_2,1	196.3	1.22
49 199.1	U
49 215.9	o-CH₂OCH₂	49 216.009	8_5,3–8_4,4	76.2	1.72
49 461.9	AA-CH₃OCH₃	49 461.106	4_0,4–3_1,3	9.1	0.36
	EE-CH₃OCH₃	49 461.858	4_0,4–3_1,3	9.1	0.36
	AE-CH₃OCH₃	49 462.609	4_0,4–3_1,3	9.1	0.36
	EA-CH₃OCH₃	49 462.612	4_0,4–3_1,3	9.1	0.36
49 509.3	A-CH₃OCOH ν_t = 1	49 508.993	4_2,2–3_2,1	197.0	1.25
49 533.1	o-CH₂OCH₂	49 533.149	10_7,3–10_6,4	118.2	1.98
49 558.7	H79δ	49 556.792
49 729.3	H72γ	49 726.698
49 765.7	U
49 962.9	NH₂D	49 962.831	2_1,2–2_0,2ν = 0–1	50.1	16.3

Notes.

^(†)

Observed frequency in red means that the line is below 3σ (see Fig. A.1).

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