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Physics

Spectroscopy

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  • Published Date
Displaying 176 - 200 of 1691

Coherent contributions to population dynamics in a semiconductor microcavity

March 29, 2022
Author(s)
Jagannath Paul, Hendrik Rose, Ethan Swagel, Torsten Meier, Jared Wahlstrand, Alan Bristow
Multidimensional coherent spectroscopy (MDCS) is used to separate coherent and incoherent many-body contributions to the population-time dynamics in a GaAs-based semiconductor microcavity encapsulating a single InGaAs quantum well. In a three-pulse four

The Irradiance Instrument Subsystem (IRIS) on the Airborne-Lunar Spectral Irradiance (Air-LUSI) Instrument

March 23, 2022
Author(s)
Steven Grantham, Thomas C. Larason, Clarence Zarobila, Stephen Maxwell, John Woodward, Kevin Turpie, S. Andrew Gadsden
The objective of the airborne LUnar Spectral Irradiance (air-LUSI) project is to make low uncertainty, SI-traceable measurements of the lunar spectral irradiance in the visible to near-infrared (VNIR) region from an aircraft above most of the optically

Laser Spectroscopy of the y7PJo states of Cr I

March 16, 2022
Author(s)
Eric Norrgard, Daniel Barker, Stephen Eckel, Sergey Porsev, Charles Cheung, Mikhail Kozlov, Ilya Tupitsyn, Marianna Safronova
Here we report measured and calculated values of decay rates of the 3d$^4$($^5$D)4s4p($^3$P$^\rmo}}$)\ y$^7$P$^\rmo}}_2,3,4}$ states of Cr I. The decay rates are measured using time-correlated single photon counting with roughly 1\,\% total uncertainty. In

Imaging 3D molecular orientation by orthogonal-pair polarization IR microscopy

February 28, 2022
Author(s)
Shuyu Xu, Chad R. Snyder, Jeremy Rowlette, Young Jong Lee
Anisotropic molecular alignment occurs ubiquitously and often heterogeneously in three dimensions (3D). However, conventional imaging approaches based on polarization can map only molecular orientation projected onto the 2D polarization plane. Here, an

Predicting solar cell performance from terahertz and microwave spectroscopy

February 26, 2022
Author(s)
Hannes Hempel, Edwin J. Heilweil, Timothy Magnanelli
Mobilities and lifetimes of photogenerated charge carriers are core properties of photovoltaic materials and can both be characterized by contactless terahertz or microwave measurements. Previously reported values for lead-halide perovskites vary by orders

Toward a New Primary Standardization of Radionuclide Massic Activity Using Microcalorimetry and Quantitative Milligram-Scale Samples

February 24, 2022
Author(s)
Ryan P. Fitzgerald, Bradley Alpert, Dan Becker, Denis E. Bergeron, Richard Essex, Kelsey Morgan, Svetlana Nour, Galen O'Neil, Dan Schmidt, Gordon A. Shaw, Daniel Swetz, R. Michael Verkouteren, Daikang Yan
We present a new paradigm for the primary standardization of radionuclide activity per mass of solution (Bq/g). Two key enabling capabilities are 4π decay-energy spectrometry using chip-scale sub-Kelvin microcalorimeters and direct realization of mass by

Absorption Spectra of Martian Dust Simulants

February 18, 2022
Author(s)
James Radney, Christopher D. Zangmeister
Understanding the climate of Mars requires a detailed understanding of the optical properties of Martian dust as it is a ubiquitous component of the atmosphere. The need for a consensus motivates measurements of terrestrial simulants under controlled

Thermal-light heterodyne spectroscopy with frequency comb calibration

February 18, 2022
Author(s)
Scott Diddams, Connor Fredrick, Franklyn Quinlan, Ryan Terrien, Suvrath Mahadevan, Freja Olsen
Precision laser spectroscopy is key to many developments in atomic and molecular physics and the advancement of related technologies such as atomic clocks and sensors. However, in important spectroscopic scenarios, such as astronomy and remote sensing, the