By Lothar Frommhold
The ebook reports our current wisdom of collision-induced absorption of infrared radiation in dense gases. The ebook starts off with a recapitulation of crucial heritage info. Experimental effects for the absorption spectra are subsequent mentioned. Then the factors and homes of dipole moments brought on by means of molecular interactions are reviewed. following chapters current the speculation of collision-induced absorption in monatomic fuel combos and in molecular gases and combinations. the ultimate bankruptcy discusses similar phenomena and critical purposes in astrophysics. The publication is a pragmatic consultant for the spectroscopic facing dense, impartial fluids.
Read or Download Collision-induced Absorption in Gases (Cambridge Monographs on Atomic, Molecular and Chemical Physics) PDF
Similar atomic & nuclear physics books
The aim of this text is to study spontaneous emission from numerous varied viewpoints, even supposing a wide a part of it is going to be dedicated to the quantum statistical theories of spontaneous emission that have been built lately, and to discussing the interrelations between diversified methods.
- Topics in Atomic Physics
- Dense Matter in Compact Stars: A Pedagogical Introduction (Lecture Notes in Physics)
- The Chemical Physics of Ice (Cambridge Monographs on Physics)
- QCD and Numerical Analysis III: Proceedings of the Third International Workshop on Numerical Analysis and Lattice QCD, Edinburgh, June-July 2003 ... in Computational Science and Engineering)
Additional resources for Collision-induced Absorption in Gases (Cambridge Monographs on Atomic, Molecular and Chemical Physics)
11) For rough estimates, the collisional cross section may be assumed to be velocity-independent, 612(^12) = 2o = constant (hard-sphere approximation), so that the mean time between collisions becomes T12 = VT21 = (vn n2 Qo)'1 with v12 = [SkT/(nml2)]1/2 . 12) The average speed is obtained with the assumption of a Maxwellian velocity distribution. The average relative speed of a collisional pair 1-2 is of the order of the root-mean-square speed, which is roughly equal to the speed of sound and varies with temperature as T" 1 / 2 .
At low pressures and/or high temperatures, especially for the lighter gases, the free-particle expressions, Eq. 4 Distribution functions The probability that two atoms 1,2 are separated by the distance R is given by the pair distribution function, g(l2\R), defined as with R = R2 — Ru R = \R\; the q\9 q2, are the laboratory position coordinates of atoms 1 and 2. 3 — R\; 9 is the angle subtended by the vectors R and Rf. The virial expansions of these distribution functions  are given by g(12) (R) = g f \R) + n, gjifW + n2 ggf (*) + ...
86 may be considered the Schrodinger representation of the absorption of radiation by quantum systems in terms of spectroscopic transitions between states |i) and | / ) .