Sub-Hz Differential Rotational Spectroscopy of Enantiomers

Satterthwaite, Lincoln; Koumarianou, Greta; Sorensen, Daniel; Patterson, David

doi:10.3390/sym14010028

Cited by 7 publications

(4 citation statements)

References 53 publications

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“…The apparatus used at UCSB is shown in Figure , and the electronics are described in ref . Helium was continuously flowed at 10 standard cubic centimeters per second (SCCM), resulting in a steady-state helium density of roughly n He = 4 f italicA italicv italicHe = 2 × 10 14 cm –3 , where f is flow in molecules per second, A is total area of all apertures in the cell, and v He is the thermal velocity of helium at 8 K.…”

Section: Methodsmentioning

confidence: 99%

Low-Temperature Gas-Phase Kinetics of Ethanol–Methanol Heterodimer Formation

et al. 2023

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The structures of gas-phase noncovalently bound clusters have long been studied in supersonic expansions. This method of study, while providing a wealth of information about the nature of noncovalent bonds, precludes observation of the formation of the cluster, as the clusters form just after the orifice of the pulsed valve. Here, we directly observe formation of ethanol−methanol dimers via microwave spectroscopy in a controlled cryogenic environment. Time profiles of the concentration of reagents in the cell yielded gas-phase reaction rate constants of k Me-g = (2.8 ± 1.4) × 10 −13 cm 3 molecule −1 s −1 and k Me-t = (1.6 ± 0.8) × 10 −13 cm 3 molecule −1 s −1 for the pseudo-secondorder ethanol−methanol dimerization reaction at 8 K. The relaxation cross section between the gauche and trans conformers of ethanol was also measured using the same technique. In addition, thermodynamic relaxation between conformers of ethanol over time allowed for selection of conformer stoichiometry in the ethanol−methanol dimerization reaction, but no change in the ratio of dimer conformers was observed with changing ethanol monomer stoichiometry.

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Section: Methodsmentioning

confidence: 99%

Low-Temperature Gas-Phase Kinetics of Ethanol–Methanol Heterodimer Formation

et al. 2023

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“…As an incomplete list, we would like to remark on other experimental approaches working on parity-violating effects on chiral molecules [ 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 ] (see [ 15 , 79 ] for more information about other experiments). Other interesting techniques have been recently proposed in the last few years [ 80 , 81 , 82 , 83 , 84 , 85 ]. Here, we will briefly comment on the Zürich and Paris proposals.…”

Section: Experiments Searching the Pvedmentioning

confidence: 99%

The Interplay between Tunneling and Parity Violation in Chiral Molecules

Martínez-Gil,

Bargueño,

Miret-Artés

2024

Entropy

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In this review, the concepts of quantum tunneling and parity violation are introduced in the context of chiral molecules. A particle moving in a double well potential provides a good model to study the behavior of chiral molecules, where the left well and right well represent the L and R enantiomers, respectively. If the model considers the quantum behavior of matter, the concept of quantum tunneling emerges, giving place to stereomutation dynamics between left- and right-handed chiral molecules. Parity-violating interactions, like the electroweak one, can be also considered, making possible the existence of an energy difference between the L and R enantiomers, the so-called parity-violating energy difference (PVED). Here we provide a brief account of some theoretical methods usually employed to calculate this PVED, also commenting on relevant experiments devoted to experimentally detect the aforementioned PVED in chiral molecules. Finally, we comment on some ways of solving the so-called Hund’s paradox, with emphasis on mean-field theory and decoherence.

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“…In this respect, a bright example is given by the observation of quantum state-resolved ro-vibrational transitions in C 60 fullerene, based on the combination of BGC with cavity-enhanced direct frequency comb spectroscopy [15]. Equally noteworthy is the achievement of sub-Hz-precision differential spectroscopy at frequencies near 15 GHz (9.7 × 10 −11 in fractional terms) between buffer-gas-cooled enantiopure samples of (R)-and (S)-1,2-propanediol, by means of a tunable microwave Fabry-Perot cavity [16].…”

Section: Mainmentioning

confidence: 99%

Absolute frequency metrology of buffer-gas-cooled molecular spectra at the 10-12 accuracy level

Aiello

Sarno

Santi

et al. 2022

Preprint

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By reducing both the internal and translational temperature of any species down to a few kelvins, the buffer-gas-cooling (BGC) technique has the potential to dramatically improve the quality of ro-vibrational molecular spectra, thus offering unique opportunities for transition frequency measurements with unprecedented accuracy. However, the difficulty in integrating metrological-grade spectroscopic tools into bulky cryogenic equipment has hitherto prevented from approaching the kHz level even in the best cases. Here, we overcome this drawback by an original opto-mechanical scheme which, effectively coupling a Lamb-dip saturated-absorption cavity ring-down spectrometer to a BGC source, allows us to determine the absolute frequency of the acetylene (ν1+ν3) R(1)e transition at 6561.0941 cm-1 with a fractional uncertainty as low as 6∙10-12. By improving the previous record with buffer-gas-cooled molecules by one order of magnitude, our approach paves the way for a number of ultra-precise low-temperature spectroscopic studies, aimed at both fundamental Physics tests and optimized laser cooling strategies.

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Sub-Hz Differential Rotational Spectroscopy of Enantiomers

Cited by 7 publications

References 53 publications

Low-Temperature Gas-Phase Kinetics of Ethanol–Methanol Heterodimer Formation

Low-Temperature Gas-Phase Kinetics of Ethanol–Methanol Heterodimer Formation

The Interplay between Tunneling and Parity Violation in Chiral Molecules

Absolute frequency metrology of buffer-gas-cooled molecular spectra at the 10-12 accuracy level

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