Investigating electron spin resonance spectroscopy of a spin-½ compound in a home-built spectrometer

Sarkar, Jit; Roy, Subhadip; Singh, Jitendra Kumar; Singh, Sourabh; Chakraborty, Tanmoy; Mitra, Chiranjib

doi:10.1063/1.5033121

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Three-dimensional rectangular and cylindrical cavity resonators exhibit high quality factors [12]. They are used in commercial [13] and home built ESR spectrometers [14] to achieve high sensitivity. In these resonators, either transverse electric [15] or transverse magnetic [16] modes are excited for the creation of a microwave magnetic field at the sample's location.…”

Section: Introductionmentioning

confidence: 99%

Detection of electron spin resonance down to 10 K using localized spoof surface plasmon

Roy¹,

Nandi²,

Das³

et al. 2021

J. Phys. D: Appl. Phys.

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In this study, novel use of the electromagnetic field profile of a localized spoof surface plasmonic mode to detect electron spin resonance (ESR) is being reported. The mode is supported on a resonator with a complementary metallic spiral structure, etched on the ground plane of a microstrip line having a characteristic impedance of 50 Ω. The change in characteristics of the mode of interest with lowering of temperature has been observed and analyzed. ESR spectra of three paramagnetic samples—2,2-diphenyl-1-picrylhydrazyl (DPPH), galvinoxyl, and 2,2,6,6-tetramethylpiperidine-1-oxyl are recorded using this resonator at room temperature. ESR spectra of DPPH are also captured down to 10 K. Potential application of the mode in the detection of microwave induced Rashba field-driven ESR has been discussed.

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Section: Introductionmentioning

confidence: 99%

Detection of electron spin resonance down to 10 K using localized spoof surface plasmon

Roy¹,

Nandi²,

Das³

et al. 2021

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In general, a three-dimensional cavity resonator is employed in an electron spin resonance spectrometer to hold the sample and to concentrate the microwave magnetic field at the sample position. This variety of microwave resonators have high quality (Q) factor which in turn leads to high sensitivity of an ESR spectrometer [5]- [6]. However, from the aspect of instrumentation of a pulsed ESR, the resonators should have low Q factor to ensure a fast response to the applied microwave pulses [7]- [8].…”

Section: Introductionmentioning

confidence: 99%

Development of planar microstrip resonators for electron spin resonance spectroscopy

Roy,

Saha,

Sarkar

et al. 2020

Preprint

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This work focuses on the development of planar microwave resonators which are to be used in electron spin resonance spectroscopic studies. Two half wavelength microstrip resonators of different geometrical shapes, namely straight ribbon and omega, are fabricated on commercially available copper clad microwave laminates. Both resonators have a characteristic impedance of 50 Ω.We have performed electromagnetic field simulations for the two microstrip resonators and have extracted practical design parameters which were used for fabrication. The effect of the geometry of the resonators on the quasi-transverse electromagnetic (quasi-TEM) modes of the resonators is noted from simulation results. The fabrication is done using optical lithography technique in which laser printed photomasks are used. This rapid prototyping technique allows us to fabricate resonators in a few hours with accuracy up to 6 mils. The resonators are characterized using a Vector Network Analyzer. The fabricated resonators are used to standardize a home built low-temperature continuous wave electron spin resonance (CW-ESR) spectrometer which operates in S-band, by capturing the absorption spectrum of the free radical DPPH, at both room temperature and 77 K. The measured value of g-factor using our resonators is consistent with the values reported in literature. The designed half wavelength planar resonators will be eventually used in setting up a pulsed electron spin resonance spectrometer by suitably modifying the CW-ESR spectrometer.

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Development of planar microstrip resonators for electron spin resonance spectroscopy

Roy

Saha

Sarkar

et al. 2020

Eur. Phys. J. Appl. Phys.

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This work focuses on the development of planar microwave resonators for use in electron spin resonance spectroscopic studies. Two half-wavelength microstrip resonators of different geometrical shapes, namely straight ribbon and omega, are fabricated on commercially available microwave laminates. Both resonators have a characteristic impedance of 50 Ω. We have performed electromagnetic field simulations for the resonators and have extracted design parameters that were used for fabrication. The effect of the geometry on the quasi-transverse electromagnetic (quasi-TEM) modes of the resonators is noted from simulation results. The fabrication is done using optical lithography in which laser printed photomasks are used. This prototyping technique allows us to fabricate resonators in a few hours with accuracy up to 6 mils. The resonators are characterized using a Vector Network Analyzer. The fabricated resonators are used in a home built low-temperature continuous wave electron spin resonance (CW-ESR) spectrometer which operates in S-band. It captures the absorption spectrum of the free radical DPPH, at both room temperature and 77 K. The measured g-factor using our resonators is consistent with the values reported in literature. Spin sensitivity of 1015 spins/gauss is achieved at 77 K. The designed resonators will be used in setting up a pulsed electron spin resonance spectrometer by suitably modifying the CW-ESR spectrometer.

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Investigating electron spin resonance spectroscopy of a spin-½ compound in a home-built spectrometer

Cited by 3 publications

References 4 publications

Detection of electron spin resonance down to 10 K using localized spoof surface plasmon

Detection of electron spin resonance down to 10 K using localized spoof surface plasmon

Development of planar microstrip resonators for electron spin resonance spectroscopy

Development of planar microstrip resonators for electron spin resonance spectroscopy

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