Effective cross sections of excitation transfer from separate υ′J′ states of Na2(B 1Πu) to atomic levels of Na and K

Quasi-resonant energy transfer in collisions: Na2(A1Σ+ u )+K(4S)

“…The cross sections for similar ET processes in sodium and potassium vapour Naz(B lII.,v'J') + Na(3 2S) [2,9,10] were of the order of 1 × 10 -14 cm 2 with no evidence for resonance enhancement. In view of these results the study of ET from an excited molecule to the atom of another species seemed to be of interest.…”

“…A number of papers [1][2][3][4][5][6] have reported results of studies on collisional energy transfer from excited alkali dimers to alkali atoms. Conditions under which the first experiments were made allowed the determination of effective cross sections for the energy transfer (ET), yielding values which were averaged over the velocity distribution and over several different initial states of the reagents, and summed over all accessible states of products.…”

“…Thus ET processes from individual vibrationalrotational states of excited molecules can be studied. In a number of cases when the energy change of the molecule is close to the energy required to excite the atom, a sharp increase of the ET cross section, compared to the nonresonant case, was observed [2,4,5]. Early attempts to explain the resonant ET from an excited state of an alkali dimer were made in the papers [2,7,8] considering the dipole-dipole and exchange interactions.…”

“…In a number of cases when the energy change of the molecule is close to the energy required to excite the atom, a sharp increase of the ET cross section, compared to the nonresonant case, was observed [2,4,5]. Early attempts to explain the resonant ET from an excited state of an alkali dimer were made in the papers [2,7,8] considering the dipole-dipole and exchange interactions. In later reports [4,5] the dependence of the cross section of ET on the initial states J' of the excited molecule was studied for the process…”

K(6S-4P) parametric emission excited by bound-bound transitions of NaK

“…Broad-band tunable stimulated electronic Raman scattering (SERS) and four-wave parametric mixing ( FWPM) from excited N a states involving Na2 molecular excitation have recently been reported (Dinev and Stefanov 1987). The effective cross sections of collisional excitation energy transfer from alkali diatomic molecules to atoms have been obtained by Janson and Klavins (1982).…”