Abstract
The absorption spectrum of CH3OH is measured optoacoustically over a 500 MHz tuning range in 84 different CO2 laser lines, and 19 assigned CO-stretch absorptions are used for establishing the linearity of the measurements over two decades of absorption coefficient. 40 new FIR laser lines originating from large offset absorption, are reported in the wavelength range between 40 and 400 μm, and their wavelengths are given with a relative accuracy of 5×10−5. 30 lines are assigned, involving CO-stretch transitions in torsionaln=0, 1, and 2 states, as well as transitions inn=3 of the vibrational ground state, pumped by transitions to Fermi interacting states.
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Work supported by the Danish National Science Research Council grant No. 11-5375