Electric dipole moment and hyperfine properties of bromoacetylene in the ground and first excited C-H stretching vibrational states

• Published in: The Journal of chemical physics 1990, Vol.92 (1), p.71-75
• Main Authors: BASS, S. M, DELEON, R. L, MUENTER, J. S
• Format: Article
• Language: English
• Subjects: 640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory; ATOMIC AND MOLECULAR PHYSICS; BEAMS; BROMINATED ALIPHATIC HYDROCARBONS; BROMINE 79; BROMINE 81; BROMINE ISOTOPES; DIPOLE MOMENTS; ELECTRIC DIPOLE MOMENTS; ELECTRIC MOMENTS; ENERGY LEVELS; Exact sciences and technology; EXCITED STATES; Fine and hyperfine structure; HALOGENATED ALIPHATIC HYDROCARBONS; HYPERFINE STRUCTURE; INFRARED SPECTRA; INTERMEDIATE MASS NUCLEI; ISOTOPES; MOLECULAR BEAMS; Molecular properties and interactions with photons; NUCLEI; ODD-EVEN NUCLEI; ORGANIC BROMINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; Physics; Properties of molecules and molecular ions; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES; SPECTRA; STABLE ISOTOPES; VIBRATIONAL STATES
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.458425

Molecular beam electric resonance spectroscopy, combined with color center laser excitation, has been used to measure the electric dipole moment and Br hyperfine properties of bromoacetylene in its ground and first excited C–H stretching vibrational states. For the HCC79Br, v=0: μ=0.229 62(1) D, eQq=648.113(3) MHz, CBr=6.4(3) kHz, and B=4000.07 MHz. For the HCC79Br, v=1: μ=0.248 82(1) D, eQq=648.160(2) MHz, CBr=7.0(3) kHz, and B=3992.79 MHz. For the HCC81Br, v=0: μ=0.229 56(1) D, eQq=541.430(1) MHz, CBr=7.4(1) kHz, and B=3978.46 MHz. For the HCC81Br, v=1: μ=0.248 61(1) D, eQq=541.464(3) MHz, CBr=7.6(4) kHz, and B=3971.34 MHz. The vibrational band origin for the C–H stretching vibration is 3367.7(2) cm−1.