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Physics

Spectroscopy

Search Publications

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Displaying 1 - 25 of 904

Speciation of cesium in a radiocesium-bearing microparticle emitted from Unit 1 during the Fukushima nuclear accident by XANES spectroscopy using transition edge sensor

September 5, 2025
Author(s)
Yoshio Takahashi, Shinya Yamada, Hikaru Miura, Yuichi Kurihara, Oki Sekizawa, Kiyofumi Nitta, Tadashi Hashimoto, Masato Tanaka, Minako Kurisu, Shinji Okada, Takaaki Itai, Hiroki Suga, Teruhiko Kashiwabara, Kohei Sakata, Hideyuki Tatsuno, Ryota Hayakawa, Hirotaka Suda, Takaya Ohashi, Yoshitaka Ishisaki, Takuma Okumura, Yuto Ichinohe, Tasuku Hayashi, Yuki Imai, Hirofumi Noda, Toru Tamagawa, Tadaaki Isobe, Toshiyuki Azuma, William Doriese, Joel Ullom, Daniel Swetz, Malcolm Durkin, Galen O'Neil, Satoshi Kohjiro, Shogo Higaki, Daisuke Tsumune, Masayoshi Yamamoto, Tomoya Uruga
The chemical state of radiocesium (RCs) was determined using X-ray absorption near-edge structure (XANES) in fluorescence mode and microbeam X-ray fluorescence (μ-XRF) mapping for the cesium (Cs) incorporated in a radiocesium-bearing silica microparticle

Quantitative Analysis of the Crystallinity of CoFeB Layers in Magnetic Random-Access Memory (MRAM) Stacks Using Extended X-ray Absorption Fine Structure Spectroscopy

September 3, 2025
Author(s)
Bruce Ravel, Matthias Gottwald, Christian Lavoie, Jean Jordan-Sweet, Steve Brown, Guohan Hu
Using Extended X-ray Absorption Fine Structure spectroscopy (EXAFS), we demonstrate a quantitative method to evaluate the degree of crystallization of thin CoFeB-based structures used in Spin Transfer Torque Magnetic Random-Access Memory (STT-MRAM). This

High-Stability Single-Ion Clock with 5.5 x 10^-19 Systematic Uncertainty

July 14, 2025
Author(s)
Mason Marshall, Daniel Rodriguez Castillo, Willa Dworschack, Alexander Aeppli, Kyungtae Kim, Dahyeon Lee, William Warfield, Nicholas Nardelli, Tara Fortier, Jun Ye, David Ray Leibrandt, David Hume
We report a single-ion optical atomic clock with fractional frequency uncertainty of 5.5 x 10^-19 and frequency stability of 3.5 x 10^-16/sqrttau/s}, based on quantum logic spectroscopy of a single 27Al+ ion. A co-trapped 25Mg+ ion provides sympathetic

Non-resonant Two-photon X-ray Absorption in Cu

July 10, 2025
Author(s)
Joshua Kas, John Rehr, Joachim Stohr, John Vinson
We present a real-space Green's function theory and calculations of two-photon x-ray absorption (TPA). Our focus is on nonresonant K-shell TPA in metallic Cu, which has been observed experimentally at intense x-ray free electron laser (XFEL) sources. The

Solvent Exclusion Effect on Infrared Absorption Spectroscopy

July 9, 2025
Author(s)
Young Lee, Charles Camp, Bonghwan Chon, Seong-Min Kim, Sang Hak Lee
Absorption spectroscopy of a solution containing an analyte solute typically uses the transmission through a solvent as a reference based on the assumption that the solvent does not absorb light. However, when a solvent absorbs light, the resulting

Multi-laboratory measurements of 12CH4 2n3 band line parameters. Part I: Line intensities with relative combined standard uncertainties at the permille level

July 5, 2025
Author(s)
Zachary Reed, Manfred Birk, Yan Tan, Christina Cecelski, Georg Wagner, Shui-Ming Hu, David Long, Rui-Heng Yin, Joseph Hodges
We present accurate transition intensities for the R0 to R10 manifolds of 12CH4 in the 2ν3 tetradecad region determined independently by two separate laboratories through cavity ring-down spectroscopy and Fourier Transform spectroscopy measurements. Each

Impact of Ni-like metastable states and hyperfine quenching on charge state distribution in an EBIT

June 30, 2025
Author(s)
Chowdhury Abrar Faiyaz, Endre Takacs, Timothy Burke, FNU Dipti, Galen O'Neil, Adam Hosier, Hunter Staiger, Joseph Tan, Yuri Ralchenko
We show the effects of ladder ionization and hyperfine quenching on charge state distributions and spectral features of ions in electron beam ion trap (EBIT) devices. Ladder ionization with intermediate excitation of metastable states proceeds at lower

The Role of Cu+3 in Oxygen Evolution Activity of Copper-Oxides

May 1, 2025
Author(s)
Pooja Basera, Yang Zhao, Angel Garcia-Esparza, Finn Babbe, Neha Bothra, John Vinson, Dimosthenis Sokaras, Junko Yano, Shannon Boettcher, Michal Bajdich
Cu-based oxides and hydroxides represent an important class of materials from a catalytic and corrosion perspective. In this study, we investigate the formation of bulk and surface Cu+3 species stable under water oxidation catalysis in alkaline media. So

Compact Blackbody Radiation Atomic Sensor: Measuring Temperature using Optically Excited Atoms in Vapor Cells

April 17, 2025
Author(s)
David La Mantia, Mingxin Lei, Nikunjkumar Prajapati, Noah Schlossberger, Matthew Simons, Christopher Holloway, Julia Scherschligt, Stephen Eckel, Eric Norrgard
We demonstrate a blackbody radiation thermometer based on optically excited rubidium atoms in a vapor cell. Operating as a calibrated contact thermometer from 308K to 343 K, we realize temperature uncertainty as low as 0.04 %, and statistical temperature

Contributions of argon, nitrogen, and oxygen to air broadening in the oxygen A-band

April 16, 2025
Author(s)
Leah Stevenson, Mitchio Okumura, Joseph Hodges, Erin Adkins
The oxygen (O2) A-band is used to determine the air mass in ground- and space-based remote sensing measurements because the O2 mixing ratio in Earth's atmosphere is constant. Because errors in the retrieved air mass propagate to measurements of target gas

Efficient Energy Transfer and Photoluminescence Enhancement in 2D MoS2/bulk InSe van der Waals Heterostructures

April 13, 2025
Author(s)
Michael Altvater, Christopher Stevens, Nicholas Pike, Joshua Hendrickson, Rahul Rao, Sergiy Krylyuk, Albert Davydov, Deep Jariwala, Ruth Patcher, Michael Snure, Nicholas Glavin
Heterostructures between 2D and 3D electron systems remain critically important in developing novel and efficient optoelectronic and electronic devices. In this study, a vertical heterojunction between monolayer MoS2 and bulk InSe was developed. This

New beyond-Voigt line-shape pro le recommended for the HITRAN database

March 27, 2025
Author(s)
Piotr Wcislo, N. Stolarczyk, M. Slowinski, H. Jozwiak, Daniel Lisak, R. Ciurylo, A. Cygan, F. Schreier, C.D. Boone, A. Castrillo, L. Gianfrani, Y. Tan, S-M. Hu, Erin Adkins, Joseph Hodges, H. Tran, H.N. Ngo, J.M- Hartmann, A. Campargue, S. Beguier, R.J. Hargreaves, L.S. Rothman, I.E. Gordon
Parameters associated with the collisional perturbation of spectral lines are essential for modeling the absorption of electromagnetic radiation in planetary atmospheres. The HITRAN molecular spectroscopic database provides these parameters, although

A low-cost ultrasonic absorption spectrometer mainly using off-the-shelf parts

March 11, 2025
Author(s)
Michelle Crouse, Malgorzata Musial, Jason Widegren, Jacob Pawlik, Bryan Bosworth, Nathan Orloff, Aaron Hagerstrom, Angela Stelson, Robert Lirette
Ultrasonic absorption spectroscopy can probe intermolecular interactions that inform research into chemical engineering and pharmaceutical manufacturing processes. The only commercial ultrasonic spectrometer costs over one hundred thousand dollars, putting

An Accurate Determination of O2 A-band Line Intensities through Experiment and Theory

February 27, 2025
Author(s)
Erin Adkins, Sergei Yurchenko, Wilfrid Somogyi, Joseph Hodges
Accurate intensities of the O2 A-band 〖[b〗^1 Σ_g^+⟵X^3 Σ_g^- (0,0)] centered about 760 nm are essential to reduce biases in satellite- and ground-based remote measurements of column-integrated air mass and greenhouse gas concentration. In support of these

Quantum Emitters Induced by High Pressure and UV Laser Irradiation in Multilayer GaSe

February 14, 2025
Author(s)
Sinto Varghese, Sichenge Wang, Bimal Neupane, Bhojraj Bhandari, Yan Jiang, Roberto Gonzalez Rodriguez, Sergiy Krylyuk, Albert Davydov, Hao Yan, Yuanxi Wang, Anupama Kaul, Jingbiao Cui, Yuankun Lin
In this work, we report on defect generation in multilayer GaSe through hydrostatic pressure quenching and UV laser irradiation. The Raman line width from the UV 266 nm irradiated sample is much wider than that in pressure-quenched GaSe, corresponding to a

Absorption-Based, Passive Range Imaging from Hyperspectral Thermal Measurements

February 6, 2025
Author(s)
Unay Dorken Gallastegi, Hoover Rueda-Chacon, Martin Stevens, Vivek Goyal
Passive hyperspectral long-wave infrared measurements are remarkably informative about the surroundings, such as remote object material composition, temperature, and range; and air temperature and gas concentrations. Remote object material and temperature

Application of hard x-ray and gamma-ray TES microcalorimeters at an accelerator facility

January 24, 2025
Author(s)
Takeshi Saito, Shinji Okada, Yuichi Toyoma, Toshiyuki Azuma, Goncalo Baptista, Daniel Becker, Douglas Bennett, William Doriese, Joseph Fowler, Johnathon Gard, Tadashi Hashimoto, Ryota Hayakawa, Tasuku HAYASHI, Yuto Ichinohe, Josef Imrek, Paul Indelicato, Tadaaki Isobe, Sohtaro Kanda, Naritoshi Kawamura, John Mates, Yasuhiro Miyake, Kelsey Morgan, Hirofumi Noda, Galen O'Neil, Takuma Okumura, Nancy Paul, Daniel Schmidt, Kouichiro Shimomura, Patrick Strasser, Daniel Swetz, Tadayuki Takahashi, Motonobu Tampo, Joel Ullom, Izumi Umegaki, Joel Weber, Shinya Yamada, Daikang Yan
The x-ray spectroscopy of the muonic atom has attracted atomic, nuclear, and particle physicists since its discovery. The properties of a muonic atom, such as its binding energy or atomic radius, are different from an ordinary atom because of the

International Comparison CCQM-P229: Pilot Study to Measure Absolute Line Intensities of Selected 12C16O Transitions

January 24, 2025
Author(s)
Joseph Hodges, Zachary Reed, Katarzyna Bielska, Manfred Birk, Ruimin Guo, Gang Li, Jeong Sik Lim, Daniel Lisak, Georg Wagner
We present primary spectroscopic measurements of line intensities in the 3-0 vibrational band of 12C16O. This international measurement campaign was organized under the auspices of the Consultative Committee for Amount of Substance (CCQM) and involved six

Platinum Hydride Formation during Cathodic Corrosion in Aqueous Solutions

January 22, 2025
Author(s)
Thomas Hersbach, Angel T. Garcia-Esparza, Selwyn Hanselman, Thijs Hoogenboom, Ian McCrum, Dimitra Anastasiadou, Jeremey Feaster, Thomas Jaramillo, John Vinson, Thomas Kroll, Amanda Garcia, Petr Krtil, Dimosthenis Sokaras, Marc Koper
Cathodic corrosion is an electrochemical phenomenon that dramatically etches metals under commonly used electrocatalytic conditions. Though cathodic corrosion is thought to occur by forming a metal-containing anion, such an ion has not yet been observed

Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED

January 15, 2025
Author(s)
Goncalo Baptista, Shikha Rathi, Michael Roosa, Quentin Senetaire, Jonas Sommerfeldt, Toshiyuki Azuma, Daniel Becker, Francois Butin, Ofir Eizenberg, Joseph Fowler, Hiroyuki Fujioka, Davide Gamba, Nabil Garroum, Mauro Guerra, Tadashi Hashimoto, Takashi Higuchi, Paul Indelicato, Jorge Machado, Kelsey Morgan, Francois Nez, Jason Nobles, Ben Ohayon, Shinji Okada, Daniel Schmidt, Daniel Swetz, Joel Ullom, Pauline Yzombard, Marco Zito, Nancy Paul
PAX (antiProtonic Atom X-ray spectroscopy) is a new experiment with the aim to test strong-field quantum electrodynamics (QED) effects by performing high-precision x-ray spectroscopy of antiprotonic atoms. By utilizing advanced microcalorimeter detection
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