Abstract
We present the experimental results from ionization and dissociation by multiphoton absorption (MPI) of uracil and a mixture of uracil with Ar using a Reflectron time of flight spectrometer along with radiation from 355 nm at pulsed Nd:YAG laser . We focus on the light ions production. The MPI mass spectra show that the presence and intensity of the resulting ions depend on the density power of the laser. The resulting ions in the mass spectra are identified and found similar behavior in the case of H+ and C+ as when multiple charged ions are used. Different results were found in contrast with those, recently reported, when electrons or photons of other wavelength were used. The number of 355nm absorbed photons was calculated accordingly to Keldysh theory and similar results were fond using pure uracil or uracil-Ar mixture. Our results are compared with those obtained in other laboratories under different experimental conditions, some of them show only partial agreement and differences are discussed.
Highlights
It is noteworthy that different types of Nano materials have been actively studied using X-ray absorption spectroscopy [1, 2].These works reveal the presence of an anomaly in X-ray absorption data, which arises from the polarization function due to the electron population fluctuation
The mass attenuation coefficients of graphene, multi-walled nano tubes (MWNTs) and, singlewalled nanotubes (SWNTs) have been measured for gamma energy range 356 to 1332 keV from the radioactive sources 60Co, 133Ba and 137Cs using a well calibrated gamma ray spectrometer consisting of a 3 ́ ́x 3 ́ ́ NaI(Tl) scintillation detector coupled to a PC based 8K nuclear Multi Channel Analyser (MCA)
It is very interesting to note that for all the 4 energies studied, MWNTs and Graphene exhibited higher mass attenuation coefficients followed by lead, SWNT and graphite
Summary
It is noteworthy that different types of Nano materials have been actively studied using X-ray absorption spectroscopy [1, 2].These works reveal the presence of an anomaly in X-ray absorption data, which arises from the polarization function due to the electron population fluctuation. Graphene is a rapidly rising star on the horizon of materials science and condensed-matter physics. This strictly two-dimensional material exhibits exceptionally high crystal and electronic quality, despite its short history revealed an abundance of new physics and potential. It has been shown that Nanomaterials could convert microwave energy into light or heat in high yields. These studies demonstrate that Nanomaterials could exhibit outstanding electromagnetic effects [7-. An attempt is made to investigate the gamma ray shielding properties of graphene, multi-walled nano tubes (MWNTs) and singlewalled nanotubes (SWNTs) through the measurements of mass attenuation coefficients over a wide range of energies in comparison with graphite and the traditional shielding material lead
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