FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2019914875> ?p ?o ?g. }

• W2019914875 endingPage "A1100" @default.
• W2019914875 startingPage "A1087" @default.
• W2019914875 abstract "Several methods of optical detection of electron paramagnetic resonance (epr) of excited states in crystals are outlined. The application of these methods to observation of epr in the excited metastable $overline{E}(^{2}E)$ state of ${mathrm{Cr}}^{3+}$ in ${mathrm{Al}}_{2}$${mathrm{O}}_{3}$ is described. The most recent technique made use of a high-resolution optical spectrometer to monitor the change of intensity of one of the Zeeman components of the ${R}_{1}$ fluorescent light [$overline{E}(^{2}E)ensuremath{rightarrow}^{4}A_{2}$] as $overline{E}$ was saturated by the microwaves when the magnetic field was swept through resonance. A sample doped with Cr enriched to 92% ${mathrm{Cr}}^{53}$ was used to study the hfs in the $overline{E}$ state. An upper limit of 25 kG is set on the hyperfine field per unit spin ($frac{A}{{g}_{I}{ensuremath{beta}}_{N}}$). This small value compared to that of 200 kG for the ground-state results from a near cancellation of the negative core polarization field by an equally large but positive orbital field. The spin-lattice relaxation time ${T}_{1}$ in the $overline{E}$ level was determined by observing the recovery of the light signal after the microwave saturating pulse was switched off. A continuous averaging technique using a multichannel analyzer was employed to improve the signal-to-noise ratio. ${T}_{1}$ is found to very accurately follow an Orbach process with ${T}_{1}=3.8ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}9}{e}^{frac{ensuremath{Delta}}{mathrm{kT}}}$ sec where $ensuremath{Delta}=28.8ifmmodepmelsetextpmfi{}1.0$ ${mathrm{cm}}^{ensuremath{-}1}$, i.e., the separation between $2overline{A}$ and $overline{E}$. In the range of temperature where the Orbach process was observed (4.2ifmmode^circelsetextdegreefi{}K ensuremath{rightarrow} 2.8ifmmode^circelsetextdegreefi{}K), ${T}_{1}$ was found to be essentially independent of concentration (0.05 and 0.005%) and frequency (24 and 48 kMc/sec), as anticipated. The coefficient 3.8ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}9}$ sec is significant in that it measures the maximum transition time from $2overline{A}$ to $overline{E}$, ${T}_{2overline{A}ensuremath{rightarrow}overline{E}}$, with spontaneous emission of a 29-${mathrm{cm}}^{ensuremath{-}1}$ phonon. This time plays an important role in considering the production of 29-${mathrm{cm}}^{ensuremath{-}1}$ acoustic phonons by the pumping light. Initial evidence is cited for the generation by the pumping light of a narrow-band hot-phonon spike at 29 ${mathrm{cm}}^{ensuremath{-}1}$ as seen by the spin-lattice relaxation in the $overline{E}$ level." @default.
• W2019914875 created "2016-06-24" @default.
• W2019914875 creator A5015018465 @default.
• W2019914875 creator A5050664004 @default.
• W2019914875 creator A5062783671 @default.
• W2019914875 creator A5070463011 @default.
• W2019914875 date "1965-02-15" @default.
• W2019914875 modified "2023-09-27" @default.
• W2019914875 title "Orbach Relaxation and Hyperfine Structure in the Excited<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mo>)</mml:…" @default.
• W2019914875 cites W1975333966 @default.
• W2019914875 cites W1977527861 @default.
• W2019914875 cites W1982459596 @default.
• W2019914875 cites W1984013627 @default.
• W2019914875 cites W1984784200 @default.
• W2019914875 cites W1985325438 @default.
• W2019914875 cites W1986655638 @default.
• W2019914875 cites W1991023366 @default.
• W2019914875 cites W1991482793 @default.
• W2019914875 cites W1995458855 @default.
• W2019914875 cites W2001542407 @default.
• W2019914875 cites W2002481410 @default.
• W2019914875 cites W2007046627 @default.
• W2019914875 cites W2016963197 @default.
• W2019914875 cites W2018753185 @default.
• W2019914875 cites W2027590123 @default.
• W2019914875 cites W2030891950 @default.
• W2019914875 cites W2032999966 @default.
• W2019914875 cites W2042210584 @default.
• W2019914875 cites W2042746155 @default.
• W2019914875 cites W2044870935 @default.
• W2019914875 cites W2054200166 @default.
• W2019914875 cites W2056234575 @default.
• W2019914875 cites W2057714904 @default.
• W2019914875 cites W2085111722 @default.
• W2019914875 cites W2090337846 @default.
• W2019914875 cites W2315378099 @default.
• W2019914875 cites W2321320139 @default.
• W2019914875 cites W2583397880 @default.
• W2019914875 doi "https://doi.org/10.1103/physrev.137.a1087" @default.
• W2019914875 hasPublicationYear "1965" @default.
• W2019914875 type Work @default.
• W2019914875 sameAs 2019914875 @default.
• W2019914875 citedByCount "136" @default.
• W2019914875 countsByYear W20199148752013 @default.
• W2019914875 countsByYear W20199148752015 @default.
• W2019914875 countsByYear W20199148752020 @default.
• W2019914875 crossrefType "journal-article" @default.
• W2019914875 hasAuthorship W2019914875A5015018465 @default.
• W2019914875 hasAuthorship W2019914875A5050664004 @default.
• W2019914875 hasAuthorship W2019914875A5062783671 @default.
• W2019914875 hasAuthorship W2019914875A5070463011 @default.
• W2019914875 hasConcept C121332964 @default.
• W2019914875 hasConcept C131538251 @default.
• W2019914875 hasConcept C181500209 @default.
• W2019914875 hasConcept C184779094 @default.
• W2019914875 hasConcept C187961010 @default.
• W2019914875 hasConcept C46141821 @default.
• W2019914875 hasConceptScore W2019914875C121332964 @default.
• W2019914875 hasConceptScore W2019914875C131538251 @default.
• W2019914875 hasConceptScore W2019914875C181500209 @default.
• W2019914875 hasConceptScore W2019914875C184779094 @default.
• W2019914875 hasConceptScore W2019914875C187961010 @default.
• W2019914875 hasConceptScore W2019914875C46141821 @default.
• W2019914875 hasIssue "4A" @default.
• W2019914875 hasLocation W20199148751 @default.
• W2019914875 hasOpenAccess W2019914875 @default.
• W2019914875 hasPrimaryLocation W20199148751 @default.
• W2019914875 hasRelatedWork W1642532722 @default.
• W2019914875 hasRelatedWork W197508153 @default.
• W2019914875 hasRelatedWork W1975120363 @default.
• W2019914875 hasRelatedWork W1987464424 @default.
• W2019914875 hasRelatedWork W2038832517 @default.
• W2019914875 hasRelatedWork W2052597805 @default.
• W2019914875 hasRelatedWork W2080046160 @default.
• W2019914875 hasRelatedWork W2103568331 @default.
• W2019914875 hasRelatedWork W2111236215 @default.
• W2019914875 hasRelatedWork W4200253396 @default.
• W2019914875 hasVolume "137" @default.
• W2019914875 isParatext "false" @default.
• W2019914875 isRetracted "false" @default.
• W2019914875 magId "2019914875" @default.
• W2019914875 workType "article" @default.