Dynamics of <i>p</i>-Terphenyl Crystals at the Phase Transition Temperature:  A Zero-Field EPR Study of the Photoexcited Triplet State of Pentacene in <i>p</i>-Terphenyl Crystals

Lang, Jun; Sloop, David J.; Lin, Tien‐Sung

doi:10.1021/jp070251v

Cited by 19 publications

(16 citation statements)

References 24 publications

(68 reference statements)

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“…To the best of our knowledge, such a narrow HWHM is rarely achieved in solid-state spin ensembles. Comparing with the reported HWHM values of the same spin transition obtained by different techniques [17,[23][24][25][26][27][28][29][30], the HWHM obtained herein with the aid of masing is the narrowest (see Fig. 3c).…”

supporting

confidence: 77%

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Enhanced quantum sensing with room-temperature solid-state masers

Wu¹,

Yang²,

Oxborrow³

et al. 2022

Preprint

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supporting

confidence: 77%

“…All low-temperature results [23][24][25][26] are obtained using optically detected magnetic resonance (ODMR). The free-induction decay (FID) [27,28], electron paramagnetic resonance (EPR) [29] and masers [17,30] are employed to measure the HWHM at the higher temperatures (≥ 194 K). Blue: single molecular spin; Red: spin ensemble.…”

mentioning

confidence: 99%

Enhanced quantum sensing with room-temperature solid-state masers

Wu¹,

Yang²,

Oxborrow³

et al. 2022

Preprint

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“…The Einstein coefficient B was calculated from the the magnetic mode volume V m , the spin–spin relaxation time T 2 was taken from ref. 20 and took into account the two different pentacene molecule orientations in the non-equivalent substitution sites in p -terphenyl at room temperature. A steady-state optical pump power threshold equation can be derived by disregarding the Y sublevel and setting the rate of change of cavity photons to zero, leading to:…”

Section: Methodsmentioning

confidence: 99%

Enhanced magnetic Purcell effect in room-temperature masers

et al. 2015

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Recently, the world’s first room-temperature maser was demonstrated. The maser consisted of a sapphire ring housing a crystal of pentacene-doped p-terphenyl, pumped by a pulsed rhodamine-dye laser. Stimulated emission of microwaves was aided by the high quality factor and small magnetic mode volume of the maser cavity yet the peak optical pumping power was 1.4 kW. Here we report dramatic miniaturization and 2 orders of magnitude reduction in optical pumping power for a room-temperature maser by coupling a strontium titanate resonator with the spin-polarized population inversion provided by triplet states in an optically excited pentacene-doped p-terphenyl crystal. We observe maser emission in a thimble-sized resonator using a xenon flash lamp as an optical pump source with peak optical power of 70 W. This is a significant step towards the goal of continuous maser operation.

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“…When molecular crystals are exposed to the light, individual molecules can be electronically excited to a triplet state. We applied the newly developed ZF EPR techniques to study the molecular motion of p ‐terphenyl crystals at the phase transition temperature . The p ‐terphenyl molecule has three benzene rings connected together via two single C─C bonds (Figure (a)).…”

Section: Mapping the Molecular Motion Of Organic Crystals By Zero‐fiementioning

confidence: 99%

Novel Pulsed Electron Paramagnetic Resonance Techniques for the Studies of Structure and Dynamics of Photo‐excited Triplet State of Organic Molecules: A Professional Journey

Lin

2017

J Chinese Chemical Soc

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We present a few novel pulsed electron paramagnetic resonance techniques developed in our laboratory for the studies of structure and dynamics of the photo-excited triplet state of organic molecules. We discuss many aspects of these new techniques and the significances of these measurements: (1) enhancing NMR signal intensity by dynamic nuclear polarization -integrated solid effect, (2) performing magnetic resonance in zero-field and low-field by pulsed microwave, (3) mapping molecular motion of organic crystals by pulsed zero-field and low-field experiments, (4) probing spin dynamics at level anti-crossing by fast field switching, (5) measuring hyperfine interaction by electron spin echo envelop modulation and spinecho electron nuclear double resonance and (6) detecting spin dynamics, nuclear quantum oscillation, entanglements and new avenues for quantum computer. We have employed the highly electron spin polarized pentacene triplet state as the model system in all of our pulsed EPR experiments. We performed most of our experiments at room temperature. The goals of our studies are aiming to improve spin detectability, to probe molecular dynamics, to determine electronic structures, to measure molecular interaction and motion, and to examine quantum coherence and oscillation which may yield new avenues in the applications of pulsed EPR techniques to quantum computer. a span of 35 years, he and his collaborators developed many novel pulsed electron paramagnetic resonance (EPR) techniques to study the dynamics of photo-excitation of organic molecules, to probe the spin interaction at the level anti-crossing region, to enhance the nuclear polarization by dynamic nuclear polarization, and to detect quantum oscillation and entanglement. His research interests include the applications of EPR techniques to study the structure and dynamics of the photo-excited triplet state of organic molecules, the reactivity of free radicals in photochemical reactions, and to identify free radical species (nitric oxide and oxygen-containing free radicals) associated with physical disorders in biomedical research. In collaboration with Prof. C.Y. Mou of the National Taiwan University, they applied EPR techniques to study the biocatalysis of transition-metalcontaining enzymes encapsulated in mesoporous silica materials.

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Dynamics of p-Terphenyl Crystals at the Phase Transition Temperature: A Zero-Field EPR Study of the Photoexcited Triplet State of Pentacene in p-Terphenyl Crystals

Cited by 19 publications

References 24 publications

Enhanced quantum sensing with room-temperature solid-state masers

Enhanced quantum sensing with room-temperature solid-state masers

Enhanced magnetic Purcell effect in room-temperature masers

Novel Pulsed Electron Paramagnetic Resonance Techniques for the Studies of Structure and Dynamics of Photo‐excited Triplet State of Organic Molecules: A Professional Journey

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