Study of Saturation Properties of an Inhomogeneous CW-EPR Line in the Vicinity of Rabi Resonance: Possible Application for B1 Estimation

Rakvin, Boris; Jurec, Jurica (2024) Study of Saturation Properties of an Inhomogeneous CW-EPR Line in the Vicinity of Rabi Resonance: Possible Application for B1 Estimation. Applied Magnetic Resonance, 55 (9). pp. 1183-1197. ISSN 1613-7507

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Abstract

The spectrum of continuous-wave electron paramagnetic resonance (CW-EPR) was analyzed with respect to the shape of the line under microwave (MW) power saturation. The used B1 increases until the Rabi frequency approaches the radiofrequency ω_rf used as the magnetic modulation frequency. The possible effect of Rabi resonance on spin packets system can be detected under the condition of “weak modulation near the Rabi resonance”. Inhomogeneously broadened CW-EPR lines of the P1 nitrogen centers in diamond crystal and E’ defect in irradiated vitreous SiO2 with long spin relaxation times (T1 and T2 ranged in the interval from around 2 ms to 1 μs at room temperatures) were selected for saturation study. Spectra were recorded using magnetic field modulation of 100 kHz with modulation amplitude of 27 kHz as the first harmonic for two phase-sensitive detections, detection in-phase with respect to the modulation frequency and detection 90° out-of-phase with respect of the modulation frequency. For the later detection, the resulting change near Rabi resonance can be related to the expected inversion of modulation sideband lines under resonance conditions. This effect detected in the saturation process on inhomogeneous spectral lines of P1 and E’ centers shows that both samples can be used as a standard for estimation B1 value.

Item Type:	Article
Uncontrolled Keywords:	P1 centers in diamond ; E’ centers in vitreous SiO2 EPR; ESR Microwave field intensity B1; Electron spin relaxation; Modulation sideband
Subjects:	NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions:	Division of Physical Chemistry
Projects:	Project title Project leader Project code Project type Molekulski magnetizam u naprednim čvrstim i mekim materijalima Dijana Žilić HrZZ-IP-2022-10-9292 HRZZ
Depositing User:	Jurica Jurec
Date Deposited:	08 Jan 2025 10:25
URI:	http://fulir.irb.hr/id/eprint/9359
DOI:	10.1007/s00723-024-01693-5

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