The role of the anisotropic interaction on collision induced absorption of systems containing linear molecules: The CO2–Ar case

The collision-induced absorption (CIA) spectrum for nitrogen has been measured in the spectral region below 360 cm−1 at 126, 149, 179, and 212 K. The measurements have been obtained using Fourier transform infrared (FTIR) techniques, a far infrared (FIR) laser system operating at 84.2 and 15.1 cm−1, and microwave cavity techniques. The experimental line shapes have been compared with the theoretical predictions of Joslin, based on Mori theory, and of Joslin and Gray, based on information theory alone. The data have been used to determine the quadrupole moment employing various intermolecular potentials. One Lennard–Jones potential has resulted in a quadrupole moment of 1.51 B, the value that was used in generating the theoretical line shapes. These results, when combined with our forthcoming measurements on nitrogen mixed with methane and argon, may be helpful in determining the role of CIA in calculating the opacity of some planetary atmospheres.

Download Full-text

Chlorine nuclear quadrupole resonance in mercury chlorides and complex chlorides

Australian Journal of Chemistry ◽

10.1071/ch9711753 ◽

1971 ◽

Vol 24 (9) ◽

pp. 1753 ◽

Cited By ~ 45

Author(s):

DE Scaife

Keyword(s):

Nuclear Quadrupole Resonance ◽

Covalent Bonding ◽

Distorted Octahedral ◽

Resonance Frequencies ◽

Quadrupole Resonance ◽

Unknown Structure ◽

Linear Molecules ◽

Nuclear Quadrupole ◽

Solid Compounds

Chlorine nuclear quadrupole resonance frequencies are reported for solid compounds of known structure containing linear molecules HgCl2 and Hg2Cl2, approximately trigonal HgCl3-, and a variety of distorted octahedral forms including NH4HgCl3, CsHgCl3, and K2HgCl4,H2O. Compounds of unknown structure of the type (cation+)HgCl3, (cation+)2HgCl4, (cation+)Hg2Cl5, (cation+)2Hg9Cl20, and (cation+)4HgCl6 have also been studied. There are clear correlations between observed n.q.r. frequencies and Hg-Cl infrared stretching frequencies and bond distances. These correlations show the dependence of the degree of covalent bonding in the Hg-Cl bond with distance. The n.q.r. data confirm that many of the complex chlorides of mercury are built up by the joining of octahedral HgCl6 units, distorted in such a way as to preserve to varying extents the identity of the HgCl2 molecule. �� Predictions of the structures are made for some complex chlorides of unknown structure, and the role of bridging in building up the compounds is discussed in terms of observed n.q.r. data for bridging chlorines.

Download Full-text

The role of fluorine-doped cladding in radiation-induced absorption of silica optical fibers

IEEE Transactions on Nuclear Science ◽

10.1109/tns.2002.1039675 ◽

2002 ◽

Vol 49 (3) ◽

pp. 1410-1413 ◽

Cited By ~ 9

Author(s):

M.O. Zabezhailov ◽

A.L. Tomashuk ◽

I.V. Nikolin ◽

K.M. Golant

Keyword(s):

Optical Fibers ◽

Induced Absorption ◽

Radiation Induced

Download Full-text

Role of the coupling laser in electromagnetically induced absorption

Physical Review A ◽

10.1103/physreva.72.041802 ◽

2005 ◽

Vol 72 (4) ◽

Cited By ~ 19

Author(s):

Luca Spani Molella ◽

Rolf-Hermann Rinkleff ◽

Karsten Danzmann

Keyword(s):

Induced Absorption ◽

Coupling Laser ◽

Electromagnetically Induced Absorption

Download Full-text

Dynamics of Single and Multi-photon Ionisation Processes in Molecules

Australian Journal of Physics ◽

10.1071/ph860761 ◽

1986 ◽

Vol 39 (5) ◽

pp. 761 ◽

Cited By ~ 2

Author(s):

V McKoy ◽

SN Dixit ◽

RL Dubs ◽

DL Lynch

Keyword(s):

Synchrotron Radiation ◽

Cross Sections ◽

Single Photon ◽

Realistic Model ◽

Dye Lasers ◽

Linear Molecules ◽

Dynamical Information

Single-photon ionisation and resonant multiphoton ionisation studies, which can now be carried out using synchrotron radiation and pulsed dye lasers respectively, are providing important dynamical information on molecular photoionisation. In this paper we discuss some results of our recent studies of several, single- and multi-photon ionisation processes in molecules. The results will be taken from our studies of (i) single-photon ionisation of linear molecules with emphasis on the role of shape and autoionising resonances on these cross� sections, (ii) photoionisation from oriented NiCO as a simple but realistic model of photoemission in adsorbate-substrate systems, and (iii) resonant multiphoton ionisation of H2.

Download Full-text