| Description |
By using new laboratory transition frequencies of the H _2 F ^+ ion,
we propose a search for the ion in interstellar space. The detection
will contribute to understanding the fluorine chemistry
through determined abundances of fluorine bearing molecules.
The precursor of H2F+, the HF molecule detected in diffuse molecular
cloud towards W49N has a fairly
large abundance of (5.5-6.9) \times 10^{13} cm ^{-2}
Since the dipole moment of H _2 F ^+ 2.79 D is large compared
with 1.89 D of H _2 Cl ^+ , the H _2 F ^+ ion may be detectable
in such diffuse molecular clouds where H _3^+ is abundant.
By considering various things, we propose searches for H _2 F ^+ toward
three types of sources,
(1) G10.6-0.4(W31C), where HF has been detected,
(2) NGC 6334I, where H _2 Cl ^+ has been detected,
(3) galactic central region sources : GC IRS 21 and 2Mass J1747, where
H _3^+ is known to be abundant.
For NGC 6334I and galactic sources, HF observations are also proposed,
because of no reports for HF. |
