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Nuclear quadrupole resonance applied for arsenic oxide study; Estudo do oxido de arsenio atraves de ressonancia quadrupolar nuclear

Thesis/Dissertation:

Abstract

The objectives of this study are mounting a pulsed Nuclear Quadrupole Resonance (NQR) building a flow cryostat capable of varying the temperature continuously from 77 K to 340 K and using the spectrometer and the cryostat to study the polycrystalline arsenic oxide. The spin-lattice relaxation time (T{sub 1}), the spin-spin relaxation time (T{sub 2}) and the resonance frequency are obtained as a function of temperature. These data are obtained in 77 to 330 K interval. The relaxation times are obtained using the spin echo technique. The spin echo phenomenon is due to refocusing spins, when a 180{sup 0} C pulse is applied after a 90{sup 0} C pulse. The spin-lattice relaxation time is obtained using the plot of echo amplitude versus the repetition time. The spin-spin relaxation time is obtained using the plot of echo amplitude versus the separation between the 90{sup 0} C - 180{sup 0} C pulses. The theory developed by Bayer is used to explain the spin-lattice relaxation time and the frequency temperature dependence. The spin-spin relaxation time is discussed using the Bloch equations. (author).
Authors:
Publication Date:
Apr 01, 1991
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-3356
Reference Number:
SCA: 665100; PA: AIX-25:050850; EDB-94:113356; ERA-19:026708; NTS-95:002869; SN: 94001055334
Resource Relation:
Other Information: TH: Tese (M. Sc.).; PBD: Apr 1991
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC OXIDES; NUCLEAR QUADRUPOLE RESONANCE; ARSENIC; BLOCH EQUATIONS; NUCLEAR MAGNETIC RESONANCE; POLYCRYSTALS; QUADRUPOLE MOMENTS; SPIN; SPIN-LATTICE RELAXATION; SPIN-SPIN RELAXATION; 665100; NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
OSTI ID:
10168615
Research Organizations:
Sao Paulo Univ., SP (Brazil). Inst. de Fisica
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Other: ON: DE94631465; TRN: BR9432104050850
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
93 p.
Announcement Date:

Thesis/Dissertation:

Citation Formats

Correia, J A.S. Nuclear quadrupole resonance applied for arsenic oxide study; Estudo do oxido de arsenio atraves de ressonancia quadrupolar nuclear. Brazil: N. p., 1991. Web.
Correia, J A.S. Nuclear quadrupole resonance applied for arsenic oxide study; Estudo do oxido de arsenio atraves de ressonancia quadrupolar nuclear. Brazil.
Correia, J A.S. 1991. "Nuclear quadrupole resonance applied for arsenic oxide study; Estudo do oxido de arsenio atraves de ressonancia quadrupolar nuclear." Brazil.
@misc{etde_10168615,
title = {Nuclear quadrupole resonance applied for arsenic oxide study; Estudo do oxido de arsenio atraves de ressonancia quadrupolar nuclear}
author = {Correia, J A.S.}
abstractNote = {The objectives of this study are mounting a pulsed Nuclear Quadrupole Resonance (NQR) building a flow cryostat capable of varying the temperature continuously from 77 K to 340 K and using the spectrometer and the cryostat to study the polycrystalline arsenic oxide. The spin-lattice relaxation time (T{sub 1}), the spin-spin relaxation time (T{sub 2}) and the resonance frequency are obtained as a function of temperature. These data are obtained in 77 to 330 K interval. The relaxation times are obtained using the spin echo technique. The spin echo phenomenon is due to refocusing spins, when a 180{sup 0} C pulse is applied after a 90{sup 0} C pulse. The spin-lattice relaxation time is obtained using the plot of echo amplitude versus the repetition time. The spin-spin relaxation time is obtained using the plot of echo amplitude versus the separation between the 90{sup 0} C - 180{sup 0} C pulses. The theory developed by Bayer is used to explain the spin-lattice relaxation time and the frequency temperature dependence. The spin-spin relaxation time is discussed using the Bloch equations. (author).}
place = {Brazil}
year = {1991}
month = {Apr}
}