Infrared spectrum carbon dioxide laser

We remember that there were very few far-infrared laser lines available at the time, all of them discharge laser lines. Unfortunately, although there is a spectacular series of coincidences between the lines of the water discharge laser and the spectrum of the OH radical, the same is not true for CH. The only good coincidence is the 118.6 pm line used by Evenson, Radford and Moran [48]. Progress on the far-infrared spectrum of CH had therefore to await the development of new far-infrared laser lines, optically pumped by an infrared carbon dioxide laser. With these laser lines, two further studies of CH in the ground 2 n state were made in the Boulder laboratories, by Hougen,... 

The use of the DIAL method in the mid-infrared spectral region has arisen from the availability of the high-powered carbon dioxide laser and the wide range of species with absorption lines in the range 9-11 pm. However, the carbon dioxide laser cannot be tuned continuously across the spectrum so it is not possible to use a single carbon dioxide laser to measure all the species that have absorption lines in this region of the spectrum. Possible applications include ... 

Figure 9.21. FIRLMR spectrum of CH [53]. The spectra were recorded using a laser wavelength of 124.4 pm. The lasing medium was CH2DOH, pumped by the 10P(34) infrared line of carbon dioxide. The rotational transition involved is N = 3 2, J = 5/2 - 5/2, — <—h...

Figure 11.46. (a) Recording of the 21,2 <— 17,1 vibration-rotation transition of the HD+ ion, obtained by Doppler tuning the ion beam into resonance with a carbon dioxide infrared laser beam [88], (b) A radiofrequency/infrared double resonance spectrum obtained by pumping the v3 line shown in the infrared spectrum (see text for the assignment). 

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