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High-resolution spectroscopy of the 16-μm bending fundamental of CF4
Authors:Robin S McDowell  Martin J Reisfeld  Harold W Galbraith  Burton J Krohn  Herbert Flicker  RCraig Kennedy  Jack P Aldridge  Norris G Nereson
Institution:University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545 USA
Abstract:The 16-μm bending fundamentals (ν4) of 12CF4, 13CF4, and 14CF4 have been observed at Doppler-limited resolution using a tunable PbSnSe semiconductor diode laser. The tetrahedral splittings of the rotational manifolds have been observed in all three branches, and in particular the dense and partially overlapping transitions in the Q branches have been resolved and assigned. A least-squares fit of the Hamiltonian, including off-diagonal terms, yielded five scalar and three tensor spectroscopic constants for each of the three isotopes. From these constants the upper-state rotational constant B4 and the Coriolis constant ζ4 have been calculated, together with some of the other molecular constants. An absorption feature at about 0.18 cm?1 to the red of the main Q branch of each isotopic species has been identified as the Q branch of (ν2 + ν4) ? ν2, which is the transition that lases when CF4 is pumped by a CO2 laser at 9.4 μm (i.e., in ν2 + ν4).
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