Millimeter-Wave Spectra: Hyperfine Structure of BrCN and ICN

Millimeterwave spectrum of DC discharge produced ICN in excited vibrational states

“…The remaining halogen cyanide in *Corresponding Author this group is the heaviest member ICN. The analysis of the first ground state microwave spectrum of ICN was reported by Gordy et al [4]. Subsequently, T Oka et al [5], J K Tayler et al [6] and J B Simpson et al [7] have reported the analysis of the microwave spectrum of ICN.…”

Millimeter-wave spectrum of BrCN produced by dc discharge

“…Later on, the J ¼ 3 ! 4 rotational transitions of BrCN have been observed and analyzed by Gordy et al [9,10]. The rotational analysis has been extended to the millimeter-wave region by Burrus et al [11] and to the millimeter-wave and submillimeter-wave region by Le Guennec et al [12] who have reported only the quadrupole free line centers.…”

Microwave Spectrum of BrCN at Six Millimeters

“…13 The sensitivity of this spectrometer is approximately 5X10~7 cm"" 1 . This value was determined by comparison with lines whose absolute intensities were calculated from the formula 14 a max =2.19Xl0-i y*' 3 cm- (4) where /z is the electric dipole moment in Debye units and v is the frequency in Mc/sec. This approximate formula for linear molecules neglects hyperfine structure, and assumes a temperature of 300°K and a half-width at half-intensity of 25 Mc/sec for a pressure of 1 mm of Hg.…”

“…1 Since then, additional work has been done on the J=2-*3 transition, 2,3 as well as on the transitions /=3->4, 4 and /= 8~»9, and /= 9--»10. 5 ' 6 These spectra have been interpreted satisfactorily, using the modified first-order quadrupole theory of Casimir, 7 the secondorder quadrupole theory of Bardeen and Townes,8 the two-quadrupole theory of Bardeen and Townes,9 and the /-type doubling theory of Nielsen and Shaffer.…”