We present ammonia observations of 193 dense cores and core candidates in the Perseus
molecular cloud made using the Robert F. Byrd Green Bank Telescope. We simultaneously …

We have detected the high-excitation lines of carbon-chain molecules such as C 4 H 2 (J=
10_ {0, 10}{\mbox {--}} 9_ {0, 9}), C 4 H (N= 9 {\mbox {--}} 8, F 1, F 2), lC 3 H 2 (4 1, 3-3 1, 2) …

We completed the first spectral line survey toward a cold, dark cloud TMC-1 (cyanopolyyne
peak) in a frequency range between 8.8 and 50.0 GHz by the 45-m radio telescope of …

We perform a sensitive (line confusion limited), single-side band spectral survey towards
Orion KL with the IRAM 30 m telescope, covering the following frequency ranges: 80–115.5 …

Context. Low mass starless cores present an inhomogeneous chemical composition.
Species like CO and CS deplete at their dense interiors, while N 2 H+ and NH 3 survive in …

We report the detection in TMC-1 of the cation HCCS+(3 Σ−), which is the protonated form of
the widespread radical CCS. This is the first time that a protonated radical has been …

We have used the 3 mm receiver and upgraded antenna of Haystack Observatory to make
high spatial and spectral resolution observations of lines of N 2 H+ and C 3 H 2 in 60 dense …

Interstellar molecules are often highly reactive species, which are unstable under terrestrial
conditions, such as radicals, ions and unsaturated carbon chains. Their detection in space is …

Context. The carbon-rich envelope of the asymptotic giant branch star CW Leo, IRC+ 10216,
is one of the richest molecular sources in the sky. Available spectral surveys below 51 GHz …

The accuracy of rotational parameters obtained from high-level quantum-chemical
calculations is discussed for molecules containing second-row atoms. The main focus is on …