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 Title: COLLISON-INDUCED ABSORPTION OF OXYGEN MOLECULE AS STUDIED BY HIGH SENSITIVITY SPECTROSCOPY Author(s): Kashihara, Wataru Contributor(s): Kawai, Akio; Shoji, Atsushi Subject(s): Lineshapes, collisional effects Abstract: Oxygen dimol is transiently generated when two oxygen molecules collide. At this short period, the electron clouds of molecules are distorted and some forbidden transition electronic transitions become partially allowed. This transition is called CIA (Collision-induced absorption). There are several CIA bands appearing in the spectral region from UV to near IR. Absorption of solar radiation by oxygen dimol is a small but significant part of the total budget of incoming shortwave radiation. However, a theory predicting the lineshape of CIA is still under developing._x000d_ In this study, we measured CIA band around 630 nm that is assigned to optical transition, a$^{1}$$Delta$$_{g}$(v=0):a$^{1}$$Delta$$_{g}$(v=0)-X$^{3}$$Sigma$$_{g}$$^{-}(v=0):X^{3}$$Sigma$$_{g}$$^{-}$(v=0) of oxygen dimol. CRDS(Cavity Ring-down Spectroscopy) was employed to measure weak absorption CIA band of oxygen. Laser beam around 630 nm was generated by a dye laser that was pumped by a YAG Laser. Multiple reflection of the probe light was performed within a vacuum chamber that was equipped with two high reflective mirrors. We discuss the measured line shape of CIA on the basis of collision pair model._x000d_ Issue Date: 6/21/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/96837 DOI: 10.15278/isms.2017.WJ11 Date Available in IDEALS: 2017-07-272018-01-29
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