Formation and decay of pyrene radical cation and pyrene dimer radical cation in the absence and presence of cyclodextrins during resonant two-photon ionization of pyrene and sodium 1-pyrene sulfonate

2004 ◽  
Vol 6 (13) ◽  
pp. 3215-3220 ◽  
Author(s):  
Michihiro Hara ◽  
Sachiko Tojo ◽  
Kiyohiko Kawai ◽  
Tetsuro Majima
Keyword(s):  
Radical Cation ◽  
Two Photon ◽  
Photon Ionization ◽  
Dimer Radical Cation

Effect of Oxygen on the Formation and Decay of Stilbene Radical Cation during the Resonant Two-Photon Ionization

2005 ◽  
Vol 70 (11) ◽  
pp. 4370-4374 ◽  
Author(s):  
Michihiro Hara ◽  
Shingo Samori ◽  
Cai Xichen ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Radical Cation ◽  
Two Photon ◽  
Photon Ionization ◽  
Effect Of Oxygen

Photosensitized Reaction of Poly(L-lactic Acid) via Two-Photon Ionization of Dopant

2001 ◽  
Vol 708 ◽  
Author(s):  
Wataru Sakai ◽  
Kosuke Wakabayashi ◽  
Hiroshi Nishinaka ◽  
Hiroki Kawamoto ◽  
Motoi Kinoshita ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Molecular Orbital ◽  
Radical Cation ◽  
Main Chain ◽  
Molecular Orbital Calculation ◽  
Broad Absorption Band ◽  
Two Photon ◽  
Esr Spectrum ◽  
Photon Ionization ◽  
Semiempirical Molecular Orbital

ABSTRACTWe here studied photosensitized radical reaction of poly(L-lactic acid) (PLA) using spectrophotometry, electron spin resonance (ESR), gel permeation chromatography (GPC) measurements, and semiempirical molecular orbital calculation. PLA doped with N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) was irradiated at 77 K using UV light. After the irradiation, we observed a new broad absorption band that is assigned to TMPD radical cation produced by two-photon ionization. ESR spectrum of the irradiated sample also indicated presence of main chain scission radical of PLA as well as the TMPD radical cation. By increasing the irradiation time, the ESR spectrum changed by another radical species which is produced by dehydrogenation of PLA main chain. Spectral simulation for the obtained ESR spectra revealed changes of relative amounts. The GPC measurements clearly indicated decrease in molecular weight of PLA after the irradiation. The semiempirical molecular orbital calculation was used to confirm the reaction scheme of radical anion decomposition.

Two-photon ionization of Cs2, Rb2and RbCs using an Ar-ion

1976 ◽  
Vol 9 (5) ◽  
pp. 865-873 ◽  
Author(s):  
E H A Granneman ◽  
M Klewer ◽  
K J Nygaard ◽  
M J Van der Wiel
Keyword(s):  
Two Photon ◽  
Photon Ionization
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