The high-resolution infrared spectrum of H₃Si⁷⁹Br from 2100 to 2330 cm^-1. The v ₁ and v ₄ fundamentals

Millimeter-Wave and High Resolution Infrared Spectra of D3SiBr

“…In previous contributions from our laboratories we have The isotopic purity of the 79 Br material employed (Oak reported on the rotational (1) and rovibrational spectra of Ridge National Laboratory) was 98.6%. H 3 SiBr in the regions of the sets of interacting bands n 3 /n 6 The rotational spectra were measured with three different (1), n 2 /n 5 (2), and n 1 /n 4 (3). We have determined the J-spectrometers, depending on the frequency range.…”

“…30 to 100 kHz, depending on whether the nuclear quadrupole hyperfine structure was resolved, or only broadened the Now we set out to study the deuterated species D 3 SiBr by means of millimeter-wave (mmw) and monoisotopic lines. Above 500 GHz, a Far-IR sideband spectrometer (9) was used.…”

“…Thus experimental ground state rotational constants have to be corrected beforehand for vibrational contributions. The latter may be extracted D 3 SiBr and monoisotopic D 3 Si 79 Br were prepared in analfrom rotational spectra in vibrationally excited states, or ogy to the procedure described in (7) but using LiAlD 4 (99% from rotationally resolved vibrational spectra. D) for the transformation of ClC 6 H 4 SiCl 3 to ClC 6 H 4 SiD 3 .…”

“…several isotopic species. In practice the coordinates of the Contrary to the situation for H 3 SiBr, there are no highnonaxial atoms can only be determined from the rotational resolution IR data available for D 3 SiBr (5), previous spectra constants of isotopically off-axis substituted (e.g., deuter-being recorded at best with grating spectrometers which did ated) species. Because of the substantial change of zero point not resolve any J-dependent rotational structure (6).…”

“…A primary goal of the present project is the accurate determiThe experimental determination of the accurate structure nation of the equilibrium structure of H 3 SiBr from as many of the symmetric top molecule H 3 SiBr requires the study of isotopic data as available. several isotopic species.…”