Multiphoton absorption line shapes and branching ratios in intense laser fields: An application toH2+photodissociation

Multiphoton fragmentation ofH2+andD2Miret‐Artés1, Micha2 1995Phys. Rev. A1000View full textAdd to dashboardCite

“…2(b) In Ref. [5] we showed that for the lowest vibrational level (v=0,j= 1), the corresponding profile was Lorentzian because the interference coming from the other vibrational levels and the other Floquet blocks was not important enough to noticeably disturb it (this is also in accordance with Ref. [16]).…”

“…[10] and, in the second one [11],a new interpretation of the BS mechanism has also been proposed as an alternative to that given originally [2].In both cases, peak intensities of the pulses must be very ig h h 10"&1~10"W/cm . In our experience, the RWA and IRA are not strictly applicable at these intensities even at wavelengths of about 120 nm, where the maximum of absorption is found [5]. Fig.…”

“…For dissociation times shorter than pulse lengths, we can obtain the total photodissociation probability for a transition from an initial bound-state Ig, v, n;) to a continuum state Id, e, n/) as [5] (28) where we have used the completeness of the i In, )) set. This quantity Pd".…”

“…This representation combined with an expansion in molecular states leads to a time independent description of photodissociation in terms of Floquet blocks [13].It has the advantage of providing simple and intuitive explanations of those phenomena, and leads to close-coupling (CC) equations easily solvable. Several methods for solving such CC equations can be found in the literature [13,4,5,14]. Wavepacket propagation methods [3,6] have also been applied to the study of molecular photodissociation, and a collisional time correlation function approach to the interaction of photons with polyatomic systems has been proposed for general laser sources [15].…”

“…[5].It is a generalization of the artificial channel method [21] for the calculation of direct photodissociation cross sections at weak-field regimes. For radiative lifetimes of field-induced resonances shorter than pulse lengths, the total photodissociation probability for a transition from an initial boundelectronic state to a continuum electronic state is expressed in terms of the corresponding transition matrix element [22].…”