This is subvolume C of the Landolt-Börnstein Volume II/29 "Molecular Constants Mostly from Microwave, Molecular Beam, and Sub-Doppler Laser Spectroscopy", which is planned to appear as a series A, B, C and D1 and D2 for the diamagnetic, and E for the paramagnetic linear and polyatomic species, respectively. Like in the preceding volumes II/19 and II/24, which have appeared in 1992 and 1999, the diamagnetic substances are arranged in the manner suggested by Hill ("Hill's system", 1900), meaning an almost strict alphabetical order; details are given in the General Introduction on the following pages. The ionic species are included in the alphabetical arrangement of the neutral ones in each table. In the preface to the previous volume II/24 we had noted: It is somewhat surprising that the trend of reducing spectroscopic activities in universities and other research institutes has not led to a lower production rate of pertinent molecular literature data during the last say ten years. It seems that the opposite is true. The number of studies of Van der Waals complexes is still increasing, and naturally also their complexity. Similarly, the "normal" molecules studied under high-resolution conditions became more complicated and flexible, and interesting effects like inner hydrogen bonding have been investigated. The number of figures used to illustrate the molecular conformational structures is, therefore, also larger than in the foregoing volumes.

Table of Contents:
General Introduction.- Symmetric Top Molecules: Introduction.- 1 ArH3N Ammonia – argon (1/1).- 2 ArH4Si Silane – argon (1/1).- 3 Ar3ClH Hydrogen chloride – argon (3/1).- 4 Ar3FH Hydrogen fluoride – argon (3/1).- 5 Ar3H2O Water – argon (3/1).- 6 Ar3H2S Hydrogen sulfide – argon (3/1).- 7 Ar3H3N Ammonia – argon (3/1).- 8 AsF3 Trifluoroarsine.- 9 AsH3 Arsine.- 10 BF3 Trifluoroborane.- 11 BF3H3N Trifluoroborane – ammonia(1/1).- 12 BH4Na Sodium tetrahydroborate.- 13 B9H9S 1-Thia-closo-decaborane(9).- 14 B11H11S 1-Thia-closo-dodecaborane(11).- 15 BiH3 Bismuthine.- 16 BrClH3P Phosphine – bromine chloride (1/1).- 17 BrHO3S Sulfur trioxide – hydrogen bromide (1/1).- 18 BrH3Si Bromosilane.- 19 BrH4N Ammonia – hydrogen bromide (1/1).- 20 Br2H3P Phosphine – dibromine (1/1).- 21 CArO4S Carbon monoxide – sulfur trioxide – argon (1/1/1).- 22 CBrF3 Bromotrifluoromethane.- 23 CCl3NO2 Trichloronitromethane.- 24 CHBF3N Hydrogen – cyanide-trifluoroborane (1/1).- 25 CHCl3 Trichloromethane.- 26 CHF3 Fluoroforme.- 27 CHNO3S Hydrogen cyanide – sulfur trioxide (1/1).- 28 CH3Al Methylaluminum.- 29 CH3Br Bromomethane.- 30 CH3Cl Chloromethane.- 31 CH3Cu Methylcopper.- 32 CH3F Fluoromethane.- 33 CH3F3Si Trifluoro(methyl)silane.- 34 CH3I Iodomethane.- 35 CH3K Methylpotassium.- 36 CH3Li Methyllithium.- 37 CH3NO Carbon monoxide – ammonia (1/1).- 38 CH3NSi Silanecarbonitrile.- 39 CH3Na Methylsodium.- 40 CH3O3Re Methyltrioxorhenium.- 41 CH4 Methane.- 42 CH4Kr Methane – krypton (1/1).- 43 CH4Xe Methane – xenon (1/1).- 44 CH6Si Methylsilane.- 45 CO4S Carbon monoxide – sulfur trioxide (1/1).- 46 C2F3N Trifluoroacetonitrile.- 47 C2H2BF3N2 Hydrogen cyanide – trifluroborane (2/1).- 48 C2H2N2O3S Hydrogen cyanide – sulfur oxide (2/1).- 49 C2H3ClFN Acetonitrile – chlorine fluoride (1/1).- 50 C2H3Cl3 1,1,1-Trichloroethane.- 51 C2H3F3 1,1,1-Trifluoroethane.- 52 C2H3N Acetonitrile.- 53 C2H3NO3S Acetonitrile – sulfur trioxide (1/1).- 54 C2H3P Ethylidynephosphine.- 55 C2H4N+ Ethylideneammoniumylidene.- 56 C2H4O Methane – carbon monoxide (1/1).- 57 C2H4Sn Ethynylstannane.- 58 C2H6 Ethane.- 59 C2O2 Carbon monoxide dimer.- 60 C3HF3 3,3,3-Trifluoro-1-propyne.- 61 C3HNO3S 2-Propynenitrile – sulfur trioxide (1/1).- 62 C3H3F 1-Fluoro-1-propyne.- 63 C3H4 1,2-Propadiene.- 64 C3H4 1-Propyne.- 65 C3H6Ar Cyclopropane – argon (1/1).- 66 C3H6Kr Cyclopropane – krypton (1/1).- 67 C3H6Ne Cyclopropane – neon (1/1).- 68 C3H6S3 1,3,5-Trithiane.- 69 C3H9BF3N N,N-Dimethylmethanamine – trifluoroborane (1/1).- 70 C3H9ClGe Chlorotrimethylgermane.- 71 C3H9ClSi Chlorotrimethylsilane.- 72 C3H9ClSn Chlorotrimethylstannane.- 73 C3H9F2N N,N-Dimethylmethanamine – difluorine (1/1).- 74 C3H9ISi Iodotrimethylsilane.- 75 C3H9NO3S N,N-Trimethylmethanamine – sulfur trioxide (1/1).- 76 C3H10BrN N,N-Trimethylmethanamine – hydrogen bromide (1/1).- 77 C3H10ClN N,N-Trimethylmethanamine – hydrogen chloride (1/1).- 78 C3H10FP Trimethylphosphine – hydrogen fluoride (1/1).- 79 C3H11NS N,N-dimethylmethanamine – hydrogen sulfide (1/1).- 80 C3H12AlN Trimethylaluminum ammonia (1/1).- 81 C4BF9O Carbonyltris(trifluoromethyl)boron.- 82 C4F3N 4,4,4-Trifluoro-2-butynenitrile.- 83 C4F10 1,1,1,2,3,3,3-Heptafluoro-2-(trifluoromethyl)propane.- 84 C4HF9 1,1,1,3,3,3-Hexafluoro-2-(trifluoromethyl)propane.- 85 C4H3F3 1,1,1-Trifluoro-2-butyne.- 86 C4H3N 1-Isocyano-1-propyne.- 87 C4H9Br 2-Bromo-2-methylpropane.- 88 C4H9Cl 2-Chloro-2-methylpropane.- 89 C4H9F 2-Fluoro-2-methylpropane.- 90 C4H9F3Si Trimethyl(trifluoromethyl)silane.- 91 C4H9I 2-Iodo-2-methylpropane.- 92 C5F4 1,5,5,5-Tetrafluoro-1,3-pentadiyne.- 93 C5HF3 5,5,5-Trifluoro-1,3-pentadiyne.- 94 C5H3F 1-Fluoro-1,3-pentadiyne.- 95 C5H5In (?5-2-4-Cyclopentadien-1-yl)indium.- 96 C5H5NNiO (?5-2,4-Cyclopentadien-1-yl)nitrosylnickel.- 97 C5H5Tl (?5-2,4-Cyclopentadien-1-yl)thallium.- 98 C5H9N 2-Isocyano-2-methylpropane.- 99 C5H9N 2,2-Dimethylpropanenitrile.- 100 C6H3N 2,4-Hexadiynenitrile.- 101 C6H18BN N,N-Dimethylmethanamine-trimethylborane (1/1).- 102 C7HF3 7,7,7-Trifluoro-1,3,5-heptatriyne.- 103 C7H3F 1-Fluoro-1,3,5-heptatriyne.- 104 C7H13N 1-Azabicyclo[2.2.2]octane.- 105 C8H3N 2,4,6-Octatriynenitrile.- 106 C9H4 1,3,5,7-Nonatetrayne.- 107 C9H5NbO4 Tetracarbonyl(?5-2,4-cyclopentadien-1-yl)-niobium.- 108 C10H3N 2,4,6,8-Decatetraynenitrile.- 109 C10H15F 1-Fluorotricyclo[3.3.1.1.3,7]decane.- 110 C10MnO10Re Pentacarbonyl(pentacarbonylmanganese)-rhenium.- 111 C11H4 1,3,5,7,9-Undecapentayne.- 112 C12H3N 2,4,6,8,10-Dodecapentaynenitrile.- 113 C12H12Ti (?7-Cycloheptatrienylium)(?5-2,4-cyclopentadien-1-yl)titanium.- 114 C13H4 1,3,5,7,9,11-Tridecahexayne.- 115 C15H4 1,3,5,7,9,11,13-Pentadecaheptayne.- 116 C20H10 Dibenzo[ghi,mno]fluoranthene.- 117 ClFO3 Perchloryl fluoride.- 118 ClF4N Trifluoramine-chlorine fluoride (3/1).- 119 ClHO3S Sulfur trioxide – hydrogen chloride (1/1).- 120 ClH3IN Iodine chloride – ammonia (1/1).- 121 ClH3IP Iodine chloride – phosphine (1/1).- 122 ClH3Si Chlorosilane.- 123 ClH4N Ammonia – hydrogen chloride (1/1).- 124 ClH4P Phosphine – hydrogen chloride (1/1).- 125 FHO3S Sulfur trioxide-hydrogen fluoride (1/1).- 126 FH3Si Fluorosilane.- 127 F3HSi Trifluorosilane.- 128 F3N Trifluoramine.- 129 F3P Trifluorophosphine.- 130 GeH4 Germane.- 131 H3 Trihydrogen(1+) ion.- 132 H3KrN Ammonia – krypton (1/1).- 133 H3N Ammonia.- 134 H3NNe Ammonia – neon (1/1).- 135 H3NNe3 Ammonia – neon (1/3).- 136 H3NO3S Sulfur trioxide – ammonia (1/1).- 137 H3N3 Ammonia – dinitrogen (1/1).- 138 H3O+ Oxonium.- 139 H3OP Phosphine oxide.- 140 H3P Phosphine.- 141 H3S+ Sulfonium.- 142 H3Sb Stibine.- 143 H6O3 Water trimer.- 144 H8O4 Water tetramer.- 145 H10O5 Water pentamer.- 146 N2O3S Dinitrogen – sulfur trioxide (1/1).- 147 O3S Sulfur trioxide.