Saturation of absorption and optical strength of C2F3Cl for CO2 laser pulses

Selective dissociation of polyatomic molecules by intense infrared laser fields

“…But in a polyatomic molecule, begining with a certain vibrational energy, the density of vibrational levels increases so that they overlap one another and form a continuum of weak absorption far below the dissociation limit. Figure 4b shows the dependence of the vibrational level density on total energy G0 in electron volts stored in a molecule, calculated from the formulas given by Haarhoff.27 When the density of molecular vibrational levels P (G0) with energy G0 = 4hu is rather high, for example P-^GoR A"Pibr (12) the molecules from the stage v = 3 can directly pass into the states of the vibrational "quasi-continuum" and then reach the dissociation limit within the ground electronic state (Figure 4a). It is just such a situation that takes place, in our opinion, in SF6 molecules.…”