New far-infrared laser lines from CH/sub 3/OD methanol deuterated isotope

Infrared and far-infrared spectroscopy of 13CH3OH: TeraHertz laser lines and assignments

“…Output powers of 10 W and 110 MHz tuning range are typical for lines with higher optical gains. For the FIR cavity, we use a Fabry-Perot open resonator employed in previous works [4,5]. It is 100-cm long and 7-cm in diameter, with and has two gold-coated glass spherical mirrors of 70-cm focal length at each end.…”

“…The lines were characterized by measuring the wavelength, intensity, relative polarization, optimum operating pressure, and the infrared absorption off-set frequency relative to the center of the 13 CO 2 laser line. We determine the laser line wavelengths with an uncertainty of ±0.5 lm [4], by recording the FIR laser power as function of cavity length excursion (5 mm typically). In intensity, the lines are characterized as very strong (VS), strong (S), medium (M) or weak (W).…”

“…In intensity, the lines are characterized as very strong (VS), strong (S), medium (M) or weak (W). A VS line is expected to provide a power larger than 10 mW in a properly designed experimental apparatus, a S line a power in the 1-10 mW range, a M in the 0.1-1 mW and a W a power below to 0.1 mW [4]. The off-set was determined by the Lamb-Dip technique [14].…”

“…Since then, more than 1.500 laser lines ranging from 19 lm to 3 mm have been generated from the normal and the various isotopic substituted species of this molecule [2][3][4][5]. The basic reasons for this are: (1) the excellent overlap of the absorption C-O stretch vibrational mode of these molecules with the CO 2 laser lines; (2) the presence of one internal rotational degree of freedom; (3) the high permanent electric dipole moment components both parallel and perpendicular to the symmetry axis of the molecule.…”