The Effect of Solvation on the Mean Excitation Energy of Glycine

2009 ◽  
Vol 1 (1) ◽  
pp. 242-245 ◽  
Author(s):  
Keęstutis Aidas ◽  
Jacob Kongsted ◽  
John R. Sabin ◽  
Jens Oddershede ◽  
Kurt V. Mikkelsen ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Mean Excitation Energy ◽  
The Mean

scholarly journals Deriving the mean excitation energy map from dual-energy and proton computed tomography

2018 ◽  
Vol 6 ◽  
pp. 20-24 ◽  
Author(s):  
Gloria Vilches-Freixas ◽  
Catherine Therese Quiñones ◽  
Jean Michel Létang ◽  
Simon Rit
Keyword(s):  
Computed Tomography ◽  
Excitation Energy ◽  
Dual Energy ◽  
Mean Excitation Energy ◽  
Proton Computed Tomography ◽  
The Mean

Determination of the mean excitation energy of water from proton beam ranges

2007 ◽  
Vol 42 (10) ◽  
pp. 1683-1691 ◽  
Author(s):  
Y. Kumazaki ◽  
T. Akagi ◽  
T. Yanou ◽  
D. Suga ◽  
Y. Hishikawa ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Proton Beam ◽  
Mean Excitation Energy ◽  
The Mean

scholarly journals A measurement of the mean electronic excitation energy of liquid xenon

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Laura Baudis ◽  
Patricia Sanchez-Lucas ◽  
Kevin Thieme
Keyword(s):  
Excitation Energy ◽  
Rare Event ◽  
Energy Scale ◽  
Electronic Excitation Energy ◽  
Liquid Xenon ◽  
Silicon Photomultipliers ◽  
Mean Excitation Energy ◽  
Deposited Energy ◽  
The Mean ◽  
Time Projection

AbstractDetectors using liquid xenon as target are widely deployed in rare event searches. Conclusions on the interacting particle rely on a precise reconstruction of the deposited energy which requires calibrations of the energy scale of the detector by means of radioactive sources. However, a microscopic calibration, i.e. the translation from the number of excitation quanta into deposited energy, also necessitates good knowledge of the energy required to produce single scintillation photons or ionisation electrons in liquid xenon. The sum of these excitation quanta is directly proportional to the deposited energy in the target. The proportionality constant is the mean excitation energy and is commonly known as W-value. Here we present a measurement of the W-value with electronic recoil interactions in a small dual-phase xenon time projection chamber with a hybrid (photomultiplier tube and silicon photomultipliers) photosensor configuration. Our result is based on calibrations at $$\mathcal {O}(1{-}10\,{\hbox {keV}})$$ O ( 1 - 10 keV ) with internal $${^{37}\hbox {Ar}}$$ 37 Ar and $${^{83\text {m}}\hbox {Kr}}$$ 83 m Kr sources and single electron events. We obtain a value of $$W={11.5}{} \, ^{+0.2}_{-0.3} \, \mathrm {(syst.)} \, \hbox {eV}$$ W = 11.5 - 0.3 + 0.2 ( syst . ) eV , with negligible statistical uncertainty, which is lower than previously measured at these energies. If further confirmed, our result will be relevant for modelling the absolute response of liquid xenon detectors to particle interactions.

ANALYTICAL PROPOSAL FOR THE ASSESSMENT OF THE MOLECULAR EXCITATION LEVELS TO THE MEAN EXCITATION ENERGY: APPLICATION TO THE WATER MOLECULE

Anales AFA ◽  
2021 ◽  
Vol 31 (4) ◽  
pp. 157-164
Author(s):  
F.A. Geser ◽  
◽  
M. Valente ◽  
Keyword(s):  
Excitation Energy ◽  
Energy Deposition ◽  
Absorbed Dose ◽  
Radiation Physics ◽  
Analytical Scheme ◽  
Mean Excitation Energy ◽  
Fundamental Quantity ◽  
Molecular Excitation ◽  
The Mean ◽  
Definition Of

The mean excitation energy <I> is a fundamental quantity in radiation physics, concerning energy deposition in matter and absorbed dose analytical estimations for charged particles. The stopping of swift ions in different materials strongly depends on this parameter among others. This work intends to fill in part, an empty hole in the theory of stopping power: the need of analitically and theoretically assess the hIi-value for materials. The definition of the mean excitation energy using the dielectric response function is analytically integrable if the inelastic cross section parameters are known. Some dielectric models were studied, aimed at calculating the hIi-value for liquid water by theoretical means, reaching the conclusion that a decay of the order of ω −2 in frequency (energy) is needed as weak condition of the optical energy-loss function for the integrals to converge. Afterwards, the first four discrete excitation levels and the diffuse bands for water are treated in a fully analytical scheme, and further compared with numerical results, providing the contribution of these levels to hIi, with the aim of testing the proposed analytical model.

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