نتایج جستجو برای: 17o and 14n nqr

تعداد نتایج: 16827567  

2013
Mohammadreza Pahlavani Behnam Firoozi

Energy spectrum and wave functions are obtained numerically with a potential consisting of Woods–Saxon, Coulomb, and spin–orbit coupling parts for the nuclei 15O, 15N, 17O, and 17F. The radial parts of the wave functions are used to calculate some matrix elements of electromagnetic transitions. These results are applied to calculate half-lives of low-lying exited states in the one-particle 17O ...

Journal: :Journal of the American Chemical Society 2006
Alan Wong Andy P Howes Kevin J Pike Vincent Lemaître Anthony Watts Tiit Anupõld Jaan Past Ago Samoson Ray Dupree Mark E Smith

A solid-state 17O NMR 1H-decoupled double angle rotation (DOR) study of monosodium l-glutamate monohydrate (l-MSG) is reported. It is shown that all eight inequivalent sites can be resolved with DOR line widths ( approximately 65 Hz) approximately 120 times narrower than those in the MAS spectrum. The lines are tentatively assigned on the basis of their behavior under proton decoupling and the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران 1378

فرکانس nqr اتم در پیوند m-cl بعضی ترکیبات کلردار گروه چهارم با عنصر مرکزی (msi,ge,sn) به روشهای نیمه تجربی pm3,mndo,aml محاسبه شده و با مقادیر تجربی مقایسه شده است . و پس از تعیین قابلیت روش pm3، از این روش جهت تعیین ساختار کریستالی بعضی ترکیبات چهارم استفاده شده است . فرکانس nqr اتم کلر در پیوند m-clبعضی ترکیبات کلردار گروه پنجم، با عنصر مرکزی (mp,as) توسط روش pm3 محاسبه شده است . از قابلیت رو...

2012
Hiromitsu Terao Masao Hashimoto Tsutomu Okuda

The temperature dependence of the 81 Br NQR frequencies of the title compound has revealed the presence of three phases (I, II and III, in the order of decreasing temperature): Tcl (II -1) = (318 ± 10) K and Tc2 (III II) = (202 ± 1) K. The transitions were confirmed by thermal analysis (DTA). Both of the II-I and I-II transitions exhibited strong hysteresis (/. e., superheating and supercooling...

2014
Isao Kohno

The main aim of the current work is to examine if N is candidate to be clusterized nuclei or not. In order to check this attendance, we have measured the angular distributions for N ion beam elastically scattered on C target nuclei at different low energies; 17.5, 21, and 24.5MeV which are close to the Coulomb barrier energy for N+C nuclear system. Study of various transfer reactions could prov...

2001
Gang Wu

Several anisotropic nuclear spin interactions in solid potassium tetracyanomercurate(II), K2Hg(CN)4, have been characterized using 13C, ISN, and Ig9Hg N M R spectroscopy at 4.70 and 9.40 T. The carbon chemical shielding tensor is axially symmetric, with anisotropy, Au = ull 61 = 329 f 2 ppm. From the 13C and Ig9Hg N M R spectra obtained with magic-angle spinning (MAS), 1J(199Hg,13C)i, = 1540 f ...

Journal: :Physical chemistry chemical physics : PCCP 2014
Janez Seliger Veselko Žagar

Cocrystals of 4,4'-bipyridyl and several carboxylic acids were grown from the methanol solution of the cocrystal formers. Complete (14)N NQR spectra of these cocrystals have been measured using (1)H-(14)N nuclear quadrupole double resonance. The principal values of the quadrupole coupling tensor are calculated from the (14)N NQR frequencies. A large variation in the (14)N quadrupole coupling co...

2012
Stefanie Brummer Ulrich Sohling Alarich Weiss

The C1 NQR spectra of the two phases (phases I and II) of 2,3-dichloro-l,4-naphthoquinone were studied from 77 to 394 K. The crystal structure determination of the triclinic phase (phase I) was refined by single crystal X-ray diffraction. Phase I crystallizes in the space group C/-P1. The unit cell (Z = 4) has the dimensions a = 1614.3(4) pm, 6 = 828.1 (3) pm, c = 733.2(3) pm, a = 67.02(l)°, /?...

2015
Ann Catrine Eldh Mio Fredriksson Sofie Vengberg Christina Halford Lars Wallin Tobias Dahlström Ulrika Winblad

BACKGROUND With a pending need to identify potential means to improved quality of care, national quality registries (NQRs) are identified as a promising route. Yet, there is limited evidence with regards to what hinders and facilitates the NQR innovation, what signifies the contexts in which NQRs are applied and drive quality improvement. Supposedly, barriers and facilitators to NQR-driven qual...

2000
Tetsuo Asaji Tomohiro Ishizaka

Cl NQR measurements revealed two phase transitions at 14.5 K and 70 K in NH4ICl4. By deuteration of the ammonium ions, the respective transition temperature increased to 27 K and 74 K. In the lowest-temperature phase of NH4ICl4, by the deuteration a remarkable change of the temperature dependence of the Cl NQR frequencies was observed. The NQR spin-lattice relaxation-time minimum, ascribable to...

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