Propylene oxide, CH 3 C 2 H 3 O, is a stable chiral molecule that gained new attention through its recent radio astronomical discovery in the interstellar medium toward the galactic center a . Subsequently, extensive laboratory data on rotational transitions in the ground state and in the lowest vibrationally excited ν 24 torsion state were published b,c . Previously, only the 3 µm spectral range of the four C-H stretching vibration modes was measured with high spectral resolution at mid-infrared wavelength d .In the present study we used two quantum cascade laser spectrometers at 8 and 10 µm to record ro-vibrational spectra of the ν 17 fundamental mode (CH 2 rock) at 1023 cm −1 and the ν 12 ring breathing mode at 1266 cm −1 . The spectra were measured in a static cell at room temperature and in a supersonic jet expansion at low temperatures. The room temperature measurement allowed a quick assignment via graphical techniques (Loomis-Wood diagram) and determination of the molecular parameters using the SPFIT/SPCAT program package e . In the supersonic jet spectrum line splittings could be observed for certain transitions. The combination of measurements at low temperature (30K) and at room temperature conditions led to an assignment of hundreds of transitions of the very dense infrared spectrum and covers quantum numbers from lowest J and K up to J = 55 and K a = 36.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.