Excimer Formation and Decay Processes in Rare Gases

Author(s):  
Donald C. Lorentz ◽  
Donald J. Eckstrom ◽  
David L. Huestis
Keyword(s):  
1987 ◽  
Vol 86 (9) ◽  
pp. 4935-4944 ◽  
Author(s):  
H. Janssens ◽  
M. Vanmarcke ◽  
E. Desoppere ◽  
R. Bouciqué ◽  
W. Wieme

Author(s):  
William Krakow

It has long been known that defects such as stacking faults and voids can be quenched from various alloyed metals heated to near their melting point. Today it is common practice to irradiate samples with various ionic species of rare gases which also form voids containing solidified phases of the same atomic species, e.g. ref. 3. Equivalently, electron irradiation has been used to produce damage events, e.g. ref. 4. Generally all of the above mentioned studies have relied on diffraction contrast to observe the defects produced down to a dimension of perhaps 10 to 20Å. Also all these studies have used ions or electrons which exceeded the damage threshold for knockon events. In the case of higher resolution studies the present author has identified vacancy and interstitial type chain defects in ion irradiated Si and was able to identify both di-interstitial and di-vacancy chains running through the foil.


1979 ◽  
Vol 40 (C7) ◽  
pp. C7-93-C7-94
Author(s):  
P. Ranson ◽  
J. Chapelle
Keyword(s):  

1986 ◽  
Author(s):  
Franco Battaglia ◽  
Young S. Kim ◽  
Thomas F. George
Keyword(s):  

Author(s):  
David Fisher

There are eight columns in the Periodic Table. The eighth column is comprised of the rare gases, so-called because they are the rarest elements on earth. They are also called the inert or noble gases because, like nobility, they do no work. They are colorless, odorless, invisible gases which do not react with anything, and were thought to be unimportant until the early 1960s. Starting in that era, David Fisher has spent roughly fifty years doing research on these gases, publishing nearly a hundred papers in the scientific journals, applying them to problems in geophysics and cosmochemistry, and learning how other scientists have utilized them to change our ideas about the universe, the sun, and our own planet. Much Ado about (Practically) Nothing will cover this spectrum of ideas, interspersed with the author's own work which will serve to introduce each gas and the important work others have done with them. The rare gases have participated in a wide range of scientific advances-even revolutions-but no book has ever recorded the entire story. Fisher will range from the intricacies of the atomic nucleus and the tiniest of elementary particles, the neutrino, to the energy source of the stars; from the age of the earth to its future energies; from life on Mars to cancer here on earth. A whole panoply that has never before been told as an entity.


2021 ◽  
Vol 143 (4) ◽  
pp. 2025-2036
Author(s):  
Aritra Das ◽  
Ashwini Danao ◽  
Shubhojit Banerjee ◽  
A. Mohan Raj ◽  
Gaurav Sharma ◽  
...  

Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.


2012 ◽  
Vol 136 (10) ◽  
pp. 104104 ◽  
Author(s):  
Li-Yan Tang ◽  
Zong-Chao Yan ◽  
Ting-Yun Shi ◽  
James F. Babb ◽  
J. Mitroy

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