ESR spectra of interstitial hydrogen atoms in dipotassium hexafluorosilicate

1980 ◽  
Vol 84 (26) ◽  
pp. 3630-3633 ◽  
Author(s):  
Akinori Hasegawa ◽  
Koichi Nishikida ◽  
F. Williams
Keyword(s):  
Esr Spectra ◽  
Hydrogen Atoms ◽  
Interstitial Hydrogen

scholarly journals Die Erzeugung atomaren Wasserstoffs in γ-bestrahlten Bakteriophagen und in deren DNS

1968 ◽  
Vol 23 (1) ◽  
pp. 83-89 ◽  
Author(s):  
A. Müller ◽  
H. Dertinger
Keyword(s):  
Atomic Hydrogen ◽  
Esr Spectra ◽  
Hydrogen Atoms ◽  
Γ Irradiation ◽  
G Factor ◽  
Characteristic Lines ◽  
Hydrogen Lines ◽  
Inorganic Phosphates ◽  
Limits Of Error ◽  
Phosphate Groups

ESR-spectra of purified preparations of bacteriophage and of DNA extracted from these objects were found to contain the characteristic lines of atomic hydrogen after γ-irradiation at 77 °K. The experimental results demonstrate the production of atomic hydrogen by irradiation of organic materials in a direct way. The high stability of the trapped hydrogen atoms is indicated by the fact that heating to 200 °K for 10 min reduces the spectral amplitudes by a factor of two only. The yield of trapped atomic hydrogen varied between 0.05 and 0.6 while the total radical yield derived from the ESR-spectra was found between 1.0 and 3.0. Addition of moisture to vacuumdried samples did not enhance the yield of H-atoms. At 50% water content the yield was also reduced to about 50% other parameters remaining unchanged. The disappearance of hydrogen lines on heating is accompanied by an enhancement of the octet spectrum due to the addition of atomic hydrogen to thymine groups. The observation of H-stabilization in inorganic phosphates is taken to suggest trapping by phosphate groups in DNA. The efficiency of trapping is probably influenced by the presence of impurities, notably transition metals. The apparent g-factor of 2.014 ± 0.002 is explained by IS-coupling. The true g-factor obtained by application of the Breit - Rabi formula is equal to the free electron value within experimental limits of error.

Magneto-optical properties of interstitial hydrogen atoms in alkali halides

1971 ◽  
Vol 322 (1548) ◽  
pp. 27-44 ◽  
Keyword(s):  
Excited States ◽  
Magnetic Circular Dichroism ◽  
Alkali Halides ◽  
Large Temperature ◽  
Hydrogen Atoms ◽  
Temperature Dependent ◽  
Absorption Bands ◽  
Optical Effects ◽  
Charge Transfer Transitions ◽  
Interstitial Hydrogen

Measurements have been made of both Faraday rotation and magnetic circular dichroism of ultraviolet absorption bands of interstitial hydrogen atoms ( U 2 centres) in alkali halides. Large temperature dependent magneto-optical effects have been observed for the U 2 absorption bands which indicate large spin-orbit coupling in the excited states of the transitions. These effects suggest that the excited states are composed primarily of lattice ion wavefunctions. The results are explained on the basis of an l.c.a.o. model for incomplete charge–transfer transitions. Values for parameters of the model determined from our experiments and from earlier band structure calculations are in reasonable agreement.

Calorimetric study of the desorption of the interstitial hydrogen atoms in ferromagneticNd2Fe14BHx(x<~5)microcrystals

1997 ◽  
Vol 56 (2) ◽  
pp. 726-737 ◽  
Author(s):  
S. Ram ◽  
H. J-Fecht ◽  
S. Haldar ◽  
P. Ramachandrarao ◽  
H. D. Banerjee
Keyword(s):  
Calorimetric Study ◽  
Hydrogen Atoms ◽  
Interstitial Hydrogen
Sign in / Sign up

Export Citation Format

Share Document