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Table B.1.

Experimental values of available proton affinities (PA) of neutral molecules suggested to be present in the Sgr B2 cloud.

Molecule PA (kJ/mol) Source Reference
Urea 868.4 ± 2.5 NIST Zheng & Cooks (2002)
868.432 calculations at T = 15 K This work
862.549 calculations at T = 298 K This work

Cyclopropenylidene 951.1 NIST Hunter & Lias (1998)
Iron oxide 907 NIST Hunter & Lias (1998)
Methylamine 899.0 NIST Hunter & Lias (1998)
Ethanimine 885.1 NIST Hunter & Lias (1998)
C2S 869.6 NIST Hunter & Lias (1998)

Acetamide 863.6 NIST Hunter & Lias (1998)
N-methylformamide 851.3 NIST Hunter & Lias (1998)
Methyl isocyanide 839.1 NIST Hunter & Lias (1998)
Ketene 825.3 NIST Hunter & Lias (1998)
Aminoacetonitrile 824.9 NIST Hunter & Lias (1998)
Formamide 822.2 NIST Hunter & Lias (1998)
Methyl acetate 821.6 NIST Hunter & Lias (1998)
Phenol 817.3 NIST Hunter & Lias (1998)
Ethylene glycol 815.9 NIST Hunter & Lias (1998)
Acetone 812 NIST Hunter & Lias (1998)
Cyanamide 805.6 NIST Hunter & Lias (1998)
Isopropyl cyanide 803.6 NIST Hunter & Lias (1998)
Propylene oxide 803.3 NIST Hunter & Lias (1998)
Ethyl formate 799.4 NIST Hunter & Lias (1998)
Propyl cyanide 798.4 NIST Hunter & Lias (1998)
Propenal 797 NIST Hunter & Lias (1998)
Ethylcyanide 794.1 NIST Hunter & Lias (1998)
Phosphorus mononitride 789.4 NIST Hunter & Lias (1998)
Propanal 786 NIST Hunter & Lias (1998)
Vinylcyanide 784.7 NIST Hunter & Lias (1998)
Acetic acid 783.7 NIST Hunter & Lias (1998)
Methyl formate 782.5 NIST Hunter & Lias (1998)
Methyl cyanide 779.2 NIST Hunter & Lias (1998)
Silicon monoxide 777.8 NIST Hunter & Lias (1998)
Ethanol 776.4 NIST Hunter & Lias (1998)
Methyl mercaptan 773.4 NIST Hunter & Lias (1998)
Amino radical 773.4 NIST Hunter & Lias (1998)
Hydrogen isocyanide 772.3 NIST Hunter & Lias (1998)
Methyl isocyanate 764.4 NIST Hunter & Lias (1998)
Acetaldehyde 768.5 NIST Hunter & Lias (1998)
Thioformaldehyde 759.7 NIST Hunter & Lias (1998)
Methanol 754.3 NIST Hunter & Lias (1998)
Isocyanic acid 753 NIST Hunter & Lias (1998)
Cyanoacetylene 751.2 NIST Hunter & Lias (1998)
Methyl-acetylene 748 NIST Hunter & Lias (1998)
Formic acid 742.0 NIST Hunter & Lias (1998)
Water 691 NIST Hunter & Lias (1998)
Carbonyl sulfide 628.5 NIST Hunter & Lias (1998)
N2 O 575.2 NIST Hunter & Lias (1998)
Nitric oxyde 531.8 NIST Hunter & Lias (1998)
Hydrogen fluoride 484 NIST Hunter & Lias (1998)

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