Astrochemistry lies at the nexus of astronomy, chemistry, and molecular physics. On the
basis of precise laboratory data, a rich collection of more than 200 familiar and exotic …

Unidentified infrared emission bands are ubiquitous in many astronomical sources. These
bands are widely, if not unanimously, attributed to collective emissions from polycyclic …

Polycyclic aromatic hydrocarbons (PAHs) have long been invoked in the study of interstellar
and protostellar sources, but the unambiguous identification of any individual PAH has …

To date, 241 individual molecular species, composed of 19 different elements, have been
detected in the interstellar and circumstellar medium by astronomical observations. These …

We present laboratory rotational spectroscopy of five isomers of cyanoindene (2-, 4-, 5-, 6-,
and 7-cyanoindene) using a cavity Fourier transform microwave spectrometer operating …

Using radio observations with the Green Bank Telescope, evidence has now been found for
a second five-membered ring in the dense cloud Taurus Molecular Cloud-1 (TMC-1). Based …

Context. Many molecules observed in the interstellar medium are thought to result from the
thermal desorption of ices. Parameters such as the desorption energy and pre-exponential …

Abstract Benzonitrile (c-C6H5CN, where 'c'indicates a cyclic structure), a polar proxy for
benzene (c-C6H6), has the potential to serve as a highly convenient radio probe for …

Stellar systems are often formed through the collapse of dense molecular clouds which, in
turn, return copious amounts of atomic and molecular material to the interstellar medium. An …

We report the detection of large hydrocarbon cycles toward several cold dense clouds. We
observed four sources (L1495B, Lupus-1A, L483, and L1527) in the Q band (31− 50 GHz) …