Reinvestigation of the Microwave Spectrum of Acetamide

Analysis and fit of the Fourier-transform microwave spectrum of the two-top molecule N-methylacetamide

“…The nozzle was mounted in the end flange/mirror to give coaxial injection into the microwave cavity. The instrument, automated scanning, and measurement procedures have been described in detail previously [18,19]. All frequency measurements are referenced to a rubidium frequency standard.…”

Rotational spectra, conformational structures, and dipole moments of thiodiglycol by jet-cooled FTMW and ab initio calculations

“…Since the vapor pressure of TDG is rather low (<1 Â 10 2 Pa), a small sample of approximately 200 lL was transferred to a reservoir in the pulsed molecular beam valve [6]. The reservoir was then heated to 160-180°C in order to increase the vapor pressure of the sample in the carrier gas.…”

The Microwave Spectrum of Acetamide (CH3CONH2) in the Frequency Range from 12 to 200 GHz

“…From the point of view of rotational energy, K c is a good quantum number because of the oblate character of acetamide, while, from the point of view of torsional energy, K a is a good quantum number. Suenram et al have proposed a method to give a K a label to a rotation energy level in such a case (4). Even if K a is not a good quantum number, the intensities of transitions belonging to the same series, that is, having the same K a label, would be expected to change smoothly as the J quantum number increases.…”

“…The difference from the frequencies of unresolved lines is ∼600 kHz at most. Quite recently Suenram et al made additional FTMW measurements of the hyperfine structures below 26 GHz and new millimeter-wave measurements in the 78-118 GHz region (4). A total of 115 transitions including previously reported ones were analyzed to determine 28 molecular parameters.…”