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Physics

Spectroscopy

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Displaying 1 - 25 of 944

Measured and Theoretical K?-alpha X-Ray Emission Linewidths of U, Np, and Pu

September 10, 2026
Author(s)
Abigail Wessels, Jonathan William Dean, Daniel Becker, Douglas Bennett, Matthew Carpenter, Mark Croce, Joseph Fowler, Johnathon Gard, Paul Indelicato, Katrina Koehler, John Mates, Daniel McNeel, David Mercer, Daniel Schmidt, Katherine Schreiber, Daniel Swetz, Duc Vo, Sophie Weidenbenner, Joel Ullom
We present measurements of the K-alpha-1 and K-alpha-2 natural x-ray linewidths of uranium, neptunium, and plutonium (Z=92, 93, 94) obtained using a superconducting transition-edge sensor microcalorimeter array. The relative uncertainties range from 0.5%

X-ray Absorption and Resonant X-ray Emission at the Carbon Edge of Li$_2$CO$_3$

September 8, 2026
Author(s)
John Vinson, Terrence Jach, Rainer Unterumsberger, Michael Woodcox, Burkhard Beckhoff
While highly successful, density functional theory is known to have limitations owing to its neglect of many-body electron-electron interactions. This neglect leads to errors in the single-particle energies, leading to underestimated band gaps and band

Understanding the Electronic Structure of Ruthenium Oxides during Redox Cycling with High Energy Resolution X-ray Absorption Spectroscopy

August 11, 2026
Author(s)
R. Soyoung Kim, Oscar Parades Mellone, John Vinson, Angel Garcia-Esparza, Mengxin Liu, Ikenna Chris-Okoro, Eric Zhao, Yiming Ding, Haoyi Li, Lei Zhang, Geoffroy Hautier, Tanja Cuk, Jin Suntivich, Dhananjay Kumar, Dimosthenis Sokaras, Junko Yano
Ruthenium oxides are essential catalysts and charge storage materials whose performance across reactions, from the oxygen evolution reaction to the chlor-alkali process, depends critically on reversible Ru redox cycling and the associated electronic

Comparative Analysis of Voltage Losses in Perovskite and GaAs Solar Cells at Low Temperatures

August 6, 2026
Author(s)
Hurriyet Yuce Cakir, Isaac Ogunniranye, Margaret A. Stevens, Matthew P. Lumb, Kenneth J. Schmieder, Susanna Thon, Zhaoning Song, Behrang Hamadani
This study presents a comparative analysis of the open circuit voltage behavior of perovskite vs. gallium arsenide (GaAs) solar cells at low temperatures relevant to space applications. While GaAs solar cells demonstrate high power conversion efficiencies

Defect states in the electronic structure of Ga2O3 transparent conductive oxides

June 23, 2026
Author(s)
Elizaveta Pyatenko, Constantin Wansorra, Ralph Steininger, John Vinson, Wolfram Witte, Dimitrios Hariskos, Michael Powalla, Clemens Heske, Lothar Weinhardt, Dirk Hauschild
Defect states are crucial in many electronic devices. Oxygen vacancies, for example, are common in transparent conductive oxides and can both be beneficial (e.g., as dopant to enhance conductivity) as well as detrimental (e.g., leading to reduced device

A spectroscopic dataset for known provenance and1 post-consumer textiles

May 22, 2026
Author(s)
Katarina Goodge, Alexander Landauer, Cecelia Vederman, Amanda Forster
Near infrared (NIR) spectroscopy is a rapid, non-invasive technique often used for chemical bond structure identification, making it a prime candidate for feedstock identification and validation for industrial processes involving polymers. It has rapidly

Gepta-EX: A multi-channel germanium detector for X-ray absorption fine structure

May 21, 2026
Author(s)
Bruce Ravel, Abdul Rumaiz, Francesca Capocasa, GIOVANNI PINAROLI, Thomas Krings, David Siddons
We report on the development, fabrication, and performance evaluation of Gepta-EX, a compact multi-channel high-purity germanium (HPGe) detector system designed for fluorescence-mode X-ray Absorption Spectroscopy (XAS) at high photon energies. Traditional

Detecting fundamental chiral biosignatures in the ultraviolet polarization spectrum

April 25, 2026
Author(s)
William Sparks, Thomas Germer, Frank Robb, Kevin Hand, Michael Bramble, George Cooper, Hiroshi Imanaka
Chiral molecules are ubiquitous and necessary for life as we know it. Chirality is commonly defined as molecules composed of two non-superimposable mirror images (enantiomers). In extant life, biopolymers, including nucleic acids (DNA, RNA) are homochiral

Quantum signatures of proper time in optical ion clocks

April 20, 2026
Author(s)
Gabriel Sorci, Joshua Foo, Igor Pikovski, Christian Sanner, Dietrich Leibfried
Optical clocks based on atoms and ions probe relativistic effects with unprecedented sensitivity by resolving time dilation due to atom motion or different positions in the gravitational potential through frequency shifts. However, all measurements of time

Direct Observation of muonic molecules in resonance states critical to muon catalyzed fusion

April 15, 2026
Author(s)
Yuichi Toyama, Toshiyuki Azuma, Douglas Bennett, William Doriese, Malcolm Durkin, Joseph Fowler, Johnathon Gard, Tadashi Hashimoto, Ryota Hayakawa, Yuto Ichinohe, Katsuhiko Ishida, Sohtaro Kanda, Naritoshi Kawamura, Yasushi Kino, Ren Konishi, Yasuhiro Miyake, Kelsey Morgan, Ryota Nakashima, Hiroaki Natori, Hirofumi Noda, Galen O'Neil, Shinji Okada, Takuma Okumura, Kenichi Okutsu, Carl Reintsema, Kyosuke Sasaki, Toshiki Sato, Daniel Schmidt, Kouichiro Shimomura, Patrick Strasser, Daniel Swetz, Tadayuki Takahashi, Motonobu Tampo, Hideyuki Tatsuno, Joel Ullom, Izumi Umegaki, Shin Watanabe, Shinya Yamada, Takuma Yamashita

Controlling Phase Transition Dynamics in Laser-Printed Perovskite Films via Additive-Driven Strain Engineering

April 10, 2026
Author(s)
Hurriyet Yuce Cakir, Manikanta Makala, Ganga Neupane, Marielle Deconinck, Vladimir Shilovskikh, Xinyi Zhou, Rudolph Holley III, Quinn Burlingame, Yana Vaynzof, Yueh-Lin Loo, Behrang Hamadani, Oana Jurchescu
The structural phase transitions in hybrid perovskites are critical to their performance and stability, but controlling them remains a significant challenge. Here, we demonstrate that the dynamics of the low-temperature tetragonal-to-orthorhombic phase

A study of the position-dependent response of thermal kinetic inductance detectors through the use of cryogenic beam steering

April 2, 2026
Author(s)
Ian Fogarty Florang, Jonathan Dean, Joseph Fowler, Tom-Erik Haugen, Shannon Hoogerheide, Daniel Jardin, Hans Mumm, Nathan Nakamura, Matthew Natale, Galen O'Neil, Nathan Ortiz, Jeremy Paster, Thomas Rao, Avirup Roy, Daniel Swetz, Joel Ullom, Michael Vissers, Paul Szypryt
There are a number of considerations when designing a low-temperature detector for the best possible energy resolution. One that has been particularly challenging for thermal kinetic inductance detectors (TKIDs) is ensuring that the detector's response to

Origin of the voltage gap and recombination losses in all-perovskite tandem solar cells

March 19, 2026
Author(s)
Hurriyet Yuce Cakir, John Roller, Haoran Chen, Tingting Zhu, Susanna Thon, Yanfa Yan, Zhaoning Song, Behrang Hamadani
All-perovskite tandem solar cells with narrow and wide bandgap perovskite absorbers are promising candidates for low-cost and high efficiency photovoltaic applications. However, the open circuit voltage of typical tandem structures is generally smaller

A Transition-edge Sensor Spectrometer for Precision Spectroscopy of Antiprotonic Ato ms

March 9, 2026
Author(s)
Kelsey Morgan, Toshiyuki Azuma, Goncalo Baptista, Daniel Becker, Douglas Bennett, Francois Butin, Jonathan Dean, Ofir Eizenberg, Joseph Fowler, Hiroyuki Fujioka, davide gamba, Johnathon Gard, Nabil Garroum, Mauro Guerra, Tadashi Hashimoto, Takashi Higuchi, Paul Indelicato, Mark Keller, Jorge Machado, John Mates, Nathan Nakamura, Jason Nobles, Francois Nez, Ben Ohayon, Shinji Okada, Nathan Ortiz, Nancy Paul, Shikha Rathi, Michael Roosa, Takeshi Saito, Daniel Schmidt, Quentin Senetaire, Jonas Sommerfeldt, Paul Szypryt, Joel Ullom, Pauline Yzombard, Marco Zito, Daniel Swetz

Demonstration, validation, and application of hyperspectral microscopy for the collection of cyanobacterial spectral signatures

February 24, 2026
Author(s)
Natalie C. Hall, Adam Mumford, Aaron Goldfain, David Allen, Terry slonecker, Alisa Shtabnoy
Cyanobacterial and other algal blooms are an environmental concern in waterbodies worldwide. While these blooms are a nuisance for recreational activities, they can also be harmful to human and wildlife health when the algae produce and release toxins

Demonstration of Near-Infrared Open-Path Absorption Spectroscopy for Water Vapor and Temperature Monitoring During Structure-to-Structure Fire Spread Experiments

February 13, 2026
Author(s)
Erin McCaughey, Monica Flores, Christopher Brown, Alexander Maranghides, J. Houston Miller, Diana Bailey
With increasing threats from wildfires in wildland urban interface (WUI) areas, novel approaches for the characterization of fire dynamics and their interactions with built structures have accelerated. Here, we demonstrate an open-path, near-infrared laser

2025 OIC Manufacturing 'Road Runner' Challenge

February 10, 2026
Author(s)
Catherine Cooksey, Michael Jacobson, Daniel Poitras, Luke Sandilands, Amy Rigatti, John Gilmore
Measurements are presented of the fabricated optical filters submitted to the Manufacturing Challenge organized in conjunction with Optica's Topical Meeting on Optical Interference Coatings, held in Tucson in May 2025. For this Ninth edition of the

Rydberg atom reception of a handheld UHF frequency-modulated two-way radio

February 10, 2026
Author(s)
Noah Schlossberger, Tate McDonald, Nikunjkumar Prajapati, Christopher Holloway
Rydberg atoms, due to their large polarizabilities and strong transition dipole moments, have been utilized as sensitive electric field sensors. While their ability to detect modulated signals has been previously demonstrated, these studies have largely

Development of Silicon Micromachined Waveguide Filter-Banks for On-Chip Spectrometers

January 12, 2026
Author(s)
Matthew Koc, Jason Austermann, James Beall, Johannes Hubmayr, Michael Vissers, Jordan Wheeler
Development of high-speed, spatial-mapping spectrometers in the millimeter and far-infrared frequencies would enable entirely new research avenues in astronomy and cosmology. An "on-chip" spectrometer is one such technology that could enable Line Intensity

Topological Nodal Line and Weyl Magnons in the Non-Coplanar Antiferromagnet MnTe2

December 20, 2025
Author(s)
Angela Hight Walker, Thuc Mai, Kevin Garrity
Using a combination of band representation analysis, inelastic neutron scattering (INS), magneto-Raman spectroscopy measurements, and linear spin wave theory, we determine that the non-coplanar antiferromagnet MnTe2 hosts symmetry-protected topological

Chirped magneto-optical trap of molybdenum

December 12, 2025
Author(s)
Sai Naga Manoj Paladugu, Nickolas Pilgram, Stephen Eckel, Eric Norrgard
We have directly loaded a cryogenic beam of molybdenum atoms into a magneto-optical trap. By chirping the detuning of the trapping lasers, we were able to enhance the number of atoms loaded into the trap by more than a factor of 2. We optimize the trapped

UV-enabled Defect Engineering in Multilayer GaSe and InSe and UV Writing of the Grating Pattern

November 25, 2025
Author(s)
Bhojraj Bhandari, Sinto Varghese, Amar Ghimire, Bimal Neupane, Sicheng Wang, Yan Jiang, Roberto Rodrigues, Sergiy Krylyuk, Albert Davydov, Yuanxi Wang, Hao Yan, Jingbiao Cui, Yuankun Lin
III−VI post-transition-metal chalcogenides are layered semiconductor materials that exhibit direct band gaps in multilayers. Defect engineering is essential in 2D layered semiconductors for functional devices. Here, we report defect engineering in
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