Born–Oppenheimer breakdown effects and hyperfine structure in the rotational spectrum of strontium monosulfide, SrS

A molecule with small rotational constants containing an atom with a large nuclear quadrupole moment: The microwave spectrum of trans-1-iodoperfluoropropane

“…This instrument utilizes fast (<5 ls) linear frequency sweeps, or ''chirps", of microwave radiation to polarize molecules having rotational transitions within 2-4 GHz spans with in the 8-18 GHz region. Spectra from the carbon-13 species, and some weak transitions from the parent molecule, were recorded using our traditional Balle-Flygare pulsed nozzle microwave spectrometer [11,12]. Low frequency measurements (<4 GHz) were recorded using our recently developed cavity-based Fourier transform radio frequency spectrometer [13].…”

The pure rotational spectrum of pivaloyl chloride, (CH3)3CCOCl, between 800 and 18800MHz

“…A brief description of these spectrometers is given below, but they are all well described in other literature [13][14][15][16][17][18]. All measurements presented in this work were performed at the University of North Texas.…”

“…The nozzle in this spectrometer is also placed in the center of one of the cavity mirrors and pulsed parallel to the propagation of the microwaves enhancing the resolution (v20 kHz) and measurement uncertainty (v1 kHz) exhibited by the spectrometer [14]. This instrument's setup, function, and abilities have been shown in other literature [13,14,16].…”

Chirped-pulse fourier transform microwave spectroscopy of the simple chiral compound bromofluoroacetonitrile, CHBrFCN

“…The spectrometer used in this work has been described elsewhere [12,13], this spectrometer is complimentary to our cavity based instrument [14][15][16]. Briefly, the instrument utilizes fast (<5 ls) linear frequency sweeps of microwave radiation to induce a macroscopic polarization in those molecules having rotational transitions within a 2 GHz span of frequencies inside the 8-18 GHz region.…”