The vibrational transitions of H
continue to be a popular
topic among infrared spectroscopists. A highlight is the
definite detection of interstellar H
by Geballe & Oka in absorption
in the direction of deeply embedded protostars.
H
infrared emission lines were also detected in polar regions
of Saturn. The lines are weaker than those in Jupiter by two orders
of magnitude reflecting the lower plasma activity.
On the spectroscopic side, Oka and co-workers have observed the
near-infrared 3 
overtone band of H
at 1.4 
m using
InGaAsP communication diode lasers.
Spectral lines and
the distribution of H
in extremely high rotational levels have been
studied for supplying data to astronomers.
New experiments and analysis of the H
vibration-rotation
spectra were also made by the NRC group in Canada,
and by
Maier's group.
Spin selection rules in plasma chemistry of ortho- and para-H
has been experimentally demonstrated.
Oka also reported on the infrared spectra of several other ions.
The spectrum of N
H
in highly-excited vibrational states
up 10600 cm
has been observed and analyzed,
as has
the 
hot band of NH
and the
infrared spectrum of NH
.
The infrared spectrum of
CH
involving high rotational levels has been observed and
the rotational distribution studied.
The spectrum of
C
H
was measured using a hollow cathode discharge, and its
chemistry analyzed.
The infrared work at the Herzberg Institute of Astrophysics has concentrated
on the spectra of weakly-bonded complexes, including CO-N
,
CO-He,
and the HD dimer.
Fundamental infrared spectroscopy
has been performed for the 
band of C
isotopes,
C
,
CH
NC,
CH
OH isotopes,
C
H
and isotopes,
and C
O
.
High resolution
wavenumber standards for the infrared have been published.
Bernath and co-workers have used the Fourier transform method to
measure the infrared spectra of a large number of stable and unstable species,
including ND, PH,
hot H
O,
HF,
SiO,
CS,
and SH.
Pure carbon molecules, including C
and
C
have been discussed.
Theoretical calculations of ground state potential energy
surfaces and dipole moments have been made for CO,
MgO
,
NO,
SiO,
and C
H
.
Theoretical
infrared spectra
for PAH's (neutral, cations and anions) have been computed by Langhoff.