dc.contributor.author | Gross, Eugene P | |
dc.contributor.author | Otieno‐Malo, J | |
dc.date.accessioned | 2013-06-14T08:54:54Z | |
dc.date.available | 2013-06-14T08:54:54Z | |
dc.date.issued | 1972 | |
dc.identifier.citation | J. Chem. Phys. 57, 2229 (1972); | en |
dc.identifier.uri | http://jcp.aip.org/resource/1/jcpsa6/v57/i6/p2229_s1?isAuthorized=no | |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/33719 | |
dc.description.abstract | The problem studied is the rotational absorption spectrum of linear molecules of moment inertia I in a simple nonpolar buffer gas. The focus is on the behavior of the spectrum as the buffer gas pressure and the associated collision frequency ν is increased. Four regions are distinguished. (1) ν≪ℏ/I, there are sharp lines with a van Vleck‐Weisskopf line shape; (2) ν ≃ ℏ/I, the contributions from overlapping lines are summed analytically. The ratio of minimum to maximum absorption in the weakly oscillatory spectrum is computed. (3) ℏ/I<ν<(2kT/I)1/2, This is the classical inertial region where there is a single maximum in the absorption per cycle. We compute its position as it moves from an angular frequency (2kT∕I)1∕2 to lower frequencies with increasing collision frequency. (4) ν>(2kT/I)1/2, this is the region where the Debye frequency profile is valid, with the peak of absorption at an angular frequency (1∕ν) (2kT∕I). The calculations are based on a kinetic equation for the density matrix with a single relaxation time, no position change, collision model. We also compute the time dependent correlation functions needed in the theory of the rotational Raman effect of linear molecules | en |
dc.language.iso | en | en |
dc.title | Collision Broadening of Rotational Spectrum | en |
dc.type | Article | en |
local.publisher | School of Biological Sciences, University of Nairobi | en |