Astronomical Search of Vinyl Alcohol Assisted by Submillimeter Spectroscopy

Abstract

We report an extension toward the submillimeter domain of the laboratory spectroscopy of the syn and anti conformers of vinyl alcohol, a species that has been detected once in the interstellar medium, in the massive star-forming region Sagittarius B2(N) (Turner, B. E.; Apponi, A. Microwave detection of interstellar vinyl alcohol, CH 2 CHOH. Astrophys. J. 2001, 561, L207−L210, 10.1086/324762). Spectra were recorded with high accuracy (15−20 kHz) between 245 and 310 GHz by a frequencymodulation spectrometer equipped with a pyrolysis cell. Using these spectra and the refined molecular constants, we have searched for vinyl alcohol in the publicly available spectral line surveys from the ASAI [Astrochemical Surveys at Institut de Radioastronomie Millimetrique (IRAM)] Large Project, whose source sample spans the evolutionary range of a solar-type protostar and covering 75− 350 GHz (4−1 mm) in frequency. We report non-detections in all nine sources, derive upper limits to the abundance of both conformers of vinyl alcohol, and comment on possible chemical and physical explanations for the non-detections.

A Journey from Thermally Tunable Synthesis to Spectroscopy of Phenylmethanimine in Gas Phase and Solution

“…In this experiment, a different production method of PMI has been employed, as reasoned below. Indeed, PMI was produced by means of flash vacuum pyrolysis (FVP) [39, 40] of a sample of α ‐methylbenzylamine (890 °C).…”

High-resolution millimeter-wave spectroscopy of CH2DCl: Paving the way for future astronomical observations of chloromethane isotopologues

“…In case of a higher T rot , however, CH 2 DCl emission will peak at higher frequencies, e.g., around 400 GHz at 100 K. ALMA, whose capability has been already demonstrated by numerous detections [37,38], represents the best ground-based facility covering such frequency region (thanks to its ALMA Band 8 window) that can be used to search for CH 2 DCl signatures in the interstellar medium. Even in case of a non-detection, it would be instructive to derive an upper limit for its abundance in order to compare it with those of related species [39,40] or use it within astrochemical models.…”

O-bearing complex organic molecules at the cyanopolyyne peak of TMC-1: Detection of C2H3CHO, C2H3OH, HCOOCH3, and CH3OCH3

“…Here we report an unambiguous detection of the syn form, which is the most stable one, in a colder source that is much less affected by line confusion. Level energies and transition frequencies were computed from the rotational constants given by Melosso et al (2019). The components of the dipole moment along the a and Fig.…”