Electron spin relaxation in x-lithium phthalocyanine.

Electron spin relaxation in x-lithium phthalocyanine. Research Abstract Details 

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Electron spin relaxation in x-lithium phthalocyanine. Abstract Text:

Hideo Sato,Lauraine A Dalton,Duc Ha,Richard W Quine,Sandra S Eaton,Gareth R Eaton,

Continuous-wave linewidths and spin susceptibilities, spin-spin relaxation rates (1/T2), and spin-lattice relaxation rates (1/T1) for two sources of x-LiPc were measured at 9.5 GHz between 15 and 298 K. Relaxation rates at 34 GHz were measured between 80 and 298 K. Room-temperature relaxation rates also were measured at 250 MHz, 1.9 GHz, and 2.76 GHz. The temperature dependences of linewidths and spin susceptibilities are characteristic of 1-D organic conductors. The ratio of populations of localized and delocalized electrons varies with sample preparation. For a single needle between 15 and about 200 K, 1/T2 is higher for the parallel orientation, but 1/T1 is higher for the perpendicular orientation, consistent with predictions based on dipolar interactions. Between about 60 and 150 K, which is the temperature regime in which spin susceptibility is changing rapidly with temperature, 1/T1 exhibits a non-monotonic dependence on temperature and is lower at 34 GHz than at 9.5 GHz. In other organic conductors, this dependence has been attributed to a bottleneck mechanism of relaxation. At higher temperatures, 1/T1 becomes less orientation-dependent. At room temperature, T1 increases rapidly between 250 MHz (3.0 micros) and 2.76 GHz (6.3 micros) and then shows less frequency dependence up to 34 GHz (9.8 micros). The relaxation rate near room temperature might have a substantial contribution from spin hopping perpendicular to the stacking axis of the molecules.

Electron spin relaxation in x-lithium phthalocyanine. Publishing Authors By Initials

H Sato,LA Dalton,D Ha,RW Quine,SS Eaton,GR Eaton,

For similar environment and public health: environment: environment, controlled: temperature research abstracts see: environment and public health: environment: environment, controlled: temperature research

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Electron spin relaxation in x-lithium phthalocyanine. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The journal of physical chemistry. B

VOLUME: 111

Page Numbers: 7972-7

Journal Abbreviation:

ISSN: 1520-6106

DAY: 21

MONTH: 06

YEAR: 2007

Electron spin relaxation in x-lithium phthalocyanine. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101157530

Electron spin relaxation in x-lithium phthalocyanine. Keywords Mesh Terms:

KEYWORDS: Temperature

MESH TERMS: chemistry

Chemical & Substance for Abstract: Electron spin relaxation in x-lithium phthalocyanine. Information

Substance Name: lithium phthalocyanine

Registry Number: 111716-29-1

Grant and Affiliation Information for Electron spin relaxation in x-lithium phthalocyanine.

AFFILIATION: Department of Chemistry and Biochemistry and Department of Engineering, University of Denver, Denver, Colorado 80208, USA.

Country: United States

AGENCY: United States NIBIB

GRANT: EB002807

ACRONYM: EB

MEDLINETA: J Phys Chem B

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