Q’ absorption

The limiting values of aPo/aPo for arbitrary k and an infinitely large parameter x 00 equal, in the case of linearly polarized Q-absorption of light ... 

Fig. 3.3. Relative polarization moment value in ground (initial) state at linearly polarized Q-absorption.

As a result of irradiation by this field the molecule photodissociates, yielding a number of different product channels labeled by q. Absorption of the first photon of frequency lifts the system to an energy close to the energy Em of an inter- j mediate bound state Em,Jm,Mm). A second photon of frequency co2 carries th J system to the dissociating states E, k, q ). j . ... 

A carboxylic acid has a very broad -OH absorption at 2500-3300cm". 4-H.vdroxycyclohexanone H-C-Q absorption near 4 5 in H spectrum and C=0 absorption near 210 S in C spectrum. Cyclopentanecarboxylic acid -COOH absorption near 12 S in H spectrum and -COOH absorption near 170 S in "C spectrum. 

Vaks et alf have designed a novel spectrometric approach for gas analysis based on a BWO and low-Q absorption cell. The BWO spectral output was split between a reference cell and aim waveguide measurement cell. The gas in the 0.2 m pathlength waveguide reference cell was used to lock the BWO frequency to the spectral line at the 304 GHz OCS spectral line and the frequency modulated spectral source directed to the analytical cell. Detection was with a Schottky barrier diode mixer. 

Figure 8 Experimental measurements of the (A) absorption and (B) scattering

The absorbed photons, however, all come from the same direction. Therefore, the momentum transfer for q absorptions adds up to a total recoil momentum p = qhk (Fig. 9.4). This changes the velocity v of an atom which flies against the beam propagation by the amount Au = hk/M per absorption. For q absorption-emission cycles we get... 

---