Bryce Bjork

Honeywell (United States)

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Jun Ye

University of Colorado Boulder

Oliver H. Heckl

University of Vienna

Thinh Bui

National Institute of Standards and Technology

P. Bryan Changala

Center for Astrophysics Harvard & Smithsonian

Adam J. Fleisher

National Institute of Standards and Technology

Mitchio Okumura

California Institute of Technology

Garrett D. Cole

Sustainability Institute

David Follman

Clinical Solutions

Ben Spaun

National Institute of Standards and Technology

Kevin C. Cossel

National Institute of Standards and Technology

Cooperative Institutions

National Institute of Standards and Technology

University of Colorado Boulder

Honeywell (United States)

Joint Institute for Laboratory Astrophysics

National Institute of Standards

University of California, Berkeley

California Institute of Technology

University of Colorado System

Centre National de la Recherche Scientifique

Lawrence Berkeley National Laboratory

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Direct frequency comb measurement of OD + CO → DOCO kinetics

Science (2016)

Bryce Bjork Thinh Bui Oliver H. Heckl P. Bryan Changala B. Spaun

The kinetics of the hydroxyl radical (OH) + carbon monoxide (CO) reaction, which is fundamental to both atmospheric and combustion chemistry, are complex because of the formation of the hydrocarboxyl radical (HOCO) intermediate. Despite extensive studies of this reaction, HOCO has not been observed under thermal reaction conditions. Exploiting the sensitive, broadband, and high-resolution capabilities of time-resolved cavity-enhanced direct frequency comb spectroscopy, we observed deuteroxyl radical (OD) + CO reaction kinetics and detected stabilized trans-DOCO, the deuterated analog of trans-HOCO. By simultaneously measuring the time-dependent concentrations of the trans-DOCO and OD species, we observed unambiguous low-pressure termolecular dependence of the reaction rate coefficients for N2 and CO bath gases. These results confirm the HOCO formation mechanism and quantify its yield.

Hydroxyl radical

10.1126/science.aag1862

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Citations (133)

Direct measurements of DOCO isomers in the kinetics of OD+CO

arXiv (Cornell University) (2017)

Thinh Bui Bryce Bjork P. Bryan Changala Thanh Lâm Nguyễn John F. Stanton

Quantitative and mechanistically-detailed kinetics of the reaction of hydroxyl radical (OH) with carbon monoxide (CO) have been a longstanding goal of contemporary chemical kinetics. This fundamental prototype reaction plays an important role in atmospheric and combustion chemistry, motivating studies for accurate determination of the reaction rate coefficient and its pressure and temperature dependence at thermal reaction conditions. This intricate dependence can be traced directly to details of the underlying dynamics (formation, isomerization, and dissociation) involving the reactive intermediates cis- and trans-HOCO, which can only be observed transiently. Using time-resolved frequency comb spectroscopy, comprehensive mechanistic elucidation of the kinetics of the isotopic analogue deuteroxyl radical (OD) with CO has been realized. By monitoring the concentrations of reactants, intermediates, and products in real-time, the branching and isomerization kinetics and absolute yields of all species in the OD+CO reaction are quantified as a function of pressure and collision partner.

Branching (polymer chemistry)

Reactive intermediate

10.48550/arxiv.1706.04689

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High-fidelity light-shift gate for clock-state qubits

Physical review. A/Physical review, A (2021)

Charles H. Baldwin Bryce Bjork Michael Foss‐Feig John Gaebler David Hayes

To date, the highest fidelity quantum logic gates between two qubits have been achieved with variations on the geometric-phase gate in trapped ions, with the two leading variants being the Molmer-Sorensen gate and the light-shift (LS) gate. Both of these approaches have their respective advantages and challenges. For example, the latter is technically simpler and is natively insensitive to optical phases, but it has not been made to work directly on a clock-state qubit. We present a new technique for implementing the LS gate that combines the best features of these two approaches: By using a small ($\sim {\rm MHz}$) detuning from a narrow (dipole-forbidden) optical transition, we are able to operate an LS gate directly on hyperfine clock states, achieving gate fidelities of $99.74(4)\%$ using modest laser power at visible wavelengths. Current gate infidelities appear to be dominated by technical noise, and theoretical modeling suggests a path towards gate fidelity above $99.99\%$.

Controlled NOT gate

10.1103/physreva.103.012603

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Citations (20)

Mid-infrared crystalline mirrors with ultralow optical losses

C. Deutsch Garrett D. Cole David Follman Paula Heu Bryce Bjork

Summary form only given. Substrate-transferred crystalline coatings are a groundbreaking new concept for the fabrication of ultralow-loss mirrors. The low defect density single-crystal nature of these semiconductor supermirrors enables the lowest mechanical losses and hence unmatched Brownian noise performance [1], which currently limits the stability of precision optical interferometers. Another outstanding feature of these coatings is the wide spectral coverage of the GaAs/AlGaAs material platform. Limited by interband absorption at short wavelengths and the reststrahlenband at long wavelengths [2], crystalline coatings can be employed as low-loss multilayers from approximately 900 nm up to 5 μm and beyond. Excellent optical performance has been demonstrated in the near-infrared with excess optical losses (scatter + absorption) as low as 3 parts per million (ppm) [3], enabling cavity finesse values up to 360, 000 at 1.55 μm at room temperature and as high as 400, 000 at cryogenic temperatures for the same wavelength. Our first attempts at applying crystalline coatings in the mid-infrared has resulted in mirrors with excess optical losses (scatter + absorption) of 159 and 242 ppm at 3.3 and 3.7 μm, respectively. Remarkably, these results are already on par with current state-of-the-art amorphous mirror coatings, with the first use of mid-infrared crystalline mirrors in a cavity-enhanced spectroscopy setup enabling a detailed investigation of the reaction kinetics of the deuterated hydroxyl molecule, OD, and carbon monoxide, CO [4]. Absorption measurements based on photothermal common-path interferometry (PCI) [5] reveal that the optical losses are largely dominated by optical scatter. Via, PCI, we have confirmed absorption losses below 10 ppm at 3.7 μm, showing the enormous potential of GaAs/AlGaAs Bragg mirrors at mid-infrared wavelengths. An optimized fabrication process, which is currently under development, can efficiently suppress optical scatter due to accumulated growth defects on the surface. Ultimately, we foresee excess losses significantly less than 50 ppm in the mid-infrared spectral region.

10.1109/cleoe-eqec.2017.8086608

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Citations (1)

A Few Atoms Too Many: Unravelling Molecular Complexities with Frequency Comb Spectroscopy

Bulletin of the American Physical Society (2017)

Bryce Bjork

Molecular spectroscopy

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Fourier Transform Direct Frequency Comb Spectroscopy in the Near- and Mid-Infrared

Imaging and Applied Optics (2013)

Adam J. Fleisher Bryce Bjork Kevin C. Cossel Jun Ye

Fourier transform spectroscopy using near- and mid-infrared femtosecond optical frequency comb sources will be discussed, including the sensitive detection of trace molecular species within strongly absorbing gaseous mixtures.

Fourier transform spectroscopy

Optical frequency comb

Molecular spectroscopy

10.1364/fts.2013.ftu1d.1

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Absolute yield of DOCO isomers in the direct kinetics of OD+CO

arXiv (Cornell University) (2017)

Thinh Bui Bryce Bjork P. Bryan Changala Thanh Lâm Nguyễn John F. Stanton

Branching (polymer chemistry)

Reactive intermediate

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HIGH RESOLUTION ROVIBRATIONAL SPECTROSCOPY OF LARGE MOLECULES USING INFRARED FREQUENCY COMBS AND BUFFER GAS COOLING

P. Bryan Changala Jun Ye John M. Doyle Oliver H. Heckl Bryce Bjork

We have recently demonstrated the integration of cavity-enhanced direct frequency comb spectroscopy with buffer gas cooling to acquire high resolution infrared spectra of translationally and rotationally cold (∼ 10 K) gas-phase molecules.a Here, we extend this method to significantly larger systems, including naphthalene (C 10 H 8 ), a prototypical polyaromatic hydrocarbon, and adamantane (C 10 H 16 ), the fundamental building block of diamonoids.To the authors' knowledge, the latter molecule represents the largest system for which rotationally resolved spectra in the CH stretch region (3 µm) have been obtained.In addition to the measured spectra, we present several details of our experimental methods.These include introducing non-volatile species into the cold buffer gas cell and obtaining broadband spectra with single comb mode resolution.We also discuss recent modifications to the apparatus to improve its absorption sensitivity and time resolution, which facilitate the study of both larger molecular systems and cold chemical dynamics.

Buffer gas

10.15278/isms.2016.tc08

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Elucidating Reaction Kinetics with Time-Resolved Frequency Comb Spectroscopy

Bryce Bjork

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TIME-RESOLVED FREQUENCY COMB SPECTROSCOPY OF TRANSIENT FREE RADICALS IN THE MID-INFRARED SPECTRAL REGION

Proceedings of the 74th International Symposium on Molecular Spectroscopy (2014)

Bryce Bjork Jun Ye Mitchio Okumura Kevin C. Cossel Thinh Bui

Transient (computer programming)

10.15278/isms.2014.mh08

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