Search for Interstellar monohydric Thiols
  It has been pointed out by various astronomers that very interesting
relationship exists between interstellar alcohols and the corresponding thiols
(sulfur analogue of alcohols) as far as the spectroscopic properties and
chemical abundances are concerned. Monohydric alcohols such as methanol and
ethanol are widely observed and 1-propanol is recently claimed to have been
seen in Orion KL. Among the monohydric thiols, methanethiol (chemical analogue
of methanol), has been firmly detected in Orion KL and Sgr B2(N2) and
ethanethiol (chemical analogue of ethanol) has been claimed to be observed in
Sgr B2(N2) though the confirmation of this detection is yet to come. It is very
likely that higher order thiols could be observed in these regions. In this
paper, we study the formation of monohydric alcohols and their thiol analogues.
Based on our quantum chemical calculation and chemical modeling, we find that
`Tg' conformer of 1-propanethiol is a good candidate of astronomical interest.
We present various spectroscopically relevant parameters of this molecule to
assist its future detection in the Interstellar medium (ISM).
