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Physics

Spectroscopy

Projects/Programs

Displaying 1 - 25 of 40
A schematic overview showing the distribution of the standardized samples to study participants, the use of standardized protocols for measurements, and standardized reporting of data back to NIST for analysis.

AAPS Interlaboratory Study: Protein Aggregation and Immunogenicity

Ongoing
To ensure the safety and efficacy of protein-based biotherapeutics, manufacturers strive to avoid unwanted immune responses caused by the biotherapeutic. Protein immunogenicity is a complex topic and depends on multiple factors related to the product, patient profile, and treatment. 1 , 2
Schematics and diffraction patterns

Aberration-corrected scanning transmission electron microscopy

Ongoing
As devices continue to become smaller, more complex, and more highly integrated, atomic scale measurements of their structure, chemistry, strain, and electric field are increasingly crucial for device design, reliability, and optimization. The aberration-corrected scanning transmission electron
Figure 1

Advanced Microscopy for Trace and Bulk Particle Characterization

Ongoing
The goal of this project is to help develop innovative metrologies and measurement protocols for micro/nano-scale analysis of particles. In this project, state-of-the-art optical and electron-based microscopy are used to conduct research for quantitative and qualitative analysis of chemical

Atomic Spectroscopy Data Center

Ongoing
The Atomic Spectroscopic Data Center at NIST provides the most comprehensive collection of atomic spectroscopy data in the world. We monitor scientific literature and maintain bibliographic databases of all papers containing spectroscopic data. By evaluating and compiling data on energy levels
cold atom thermometer (CAT) experiment

Atomic Thermometers

Ongoing
Approach 1 Compact Blackbody Radiation Atomic Sensor (CoBRAS) The Compact Blackbody Radiation Atomic Sensor (CoBRAS) uses a thermal vapor of atoms excited by a single laser to detect BBR. From the optically excited state, atomic population is transferred to other, nearby excited states by a
absolute cryogenic radiometer

Bilateral Comparison of Spectral Responsivity in the Vacuum-Ultraviolet

Completed
The last decade has seen numerous key comparisons in the field of photometry and radiometry between different national metrology institutes (NMIs) in the context of the Mutual Recognition Arrangement. At first, these comparisons were restricted to wavelengths longer than 200 nm, with just the

Calibration of Space Weather Observational Instruments at NIST

Ongoing
Space-weather events are naturally occurring phenomena caused by activity on the Sun that affect us here on Earth. Solar storms can impact technology we rely on daily, like e.g. the Global Positioning System (GPS), communication satellites, and electric power grids. Various phenomena that originate
laser technologies

Chip-scale ultraprecise laser technologies

Ongoing
Lasers with high spectral purity are used in a diverse application space, including coherent high-speed communications, physical sensing, and manipulation of quantum systems. Lab bench scale Fabry-Perot cavities based on sophisticated vibration, thermal, and atmospheric isolation have made possible

CODATA values of the fundamental physical constants

Ongoing
CODATA recommended values of the constants Database of references for data on the constants Publications: Reviews of Modern Physics ( 1998) ( 2002) ( 2006) ( 2010) ( 2014) Journal of Physical and Chemical Reference Data ( 1998) ( 2006) ( 2010) Resource Letter FC-1: The physics of fundamental

Electronic Structure and Dynamics in Quantum Materials

Ongoing
Photoemission-based methods that interrogate solid state electronic structure have played a pivotal role in identifying and understanding key features of emerging materials. Band structure information from Angle-Resolved PhotoEmission Spectroscopy (ARPES) provided the first evidence for the d-wave
silicon photodiode

Extreme Ultraviolet Detector Calibration Service

Ongoing
The National Institute of Standards and Technology (NIST) has a wide variety of programs for the calibration of instruments and components for space-based research in the extreme ultraviolet (EUV). Many of these programs have been in existence since the 1960s, and have provided calibration support
Reflectance of two materials

Extreme ultraviolet optical constants

Ongoing
Measurements of EUV optical constants are often made by measuring the absorption or near-normal-incidence reflectivity, then performing transforms to obtain both the real and imaginary parts of the index. These sorts of measurements have considerable uncertainty because they require knowledge of
Diagram showing our multidimensional spectroscopy experiment.

Femtosecond Nonlinear Optical Spectroscopy of Nanoscale Materials

Ongoing
The purpose of this project is to develop and refine spectroscopic techniques based on nonlinear optics for the study of novel materials. Measurements that isolate the nonlinear response are often better able to uncover physical processes that, in the linear response, are subtle and hard to isolate
dual-comb spectroscopy illustration

Frequency-comb-based Spectroscopy (Dual-Comb Spectroscopy)

Ongoing
Fully stabilized frequency combs provide a broadband spectral output that is comprised of a series of narrow spectral lines or “teeth”. “Dual comb spectroscopy” provides one method to harness these properties for broadband spectroscopy. It allows the user to read-out the spectrum of a gas mixture on
Partial timeline showing the evolution of open-path dual-comb spectroscopy at NIST

Greenhouse Gas and Atmospheric Trace Gas Measurements

Ongoing
Dealing with climate change will require continued reductions in emissions, which in turn will require higher accuracies and precisions for monitoring, reporting and verification. Better monitoring will accelerate local emission reductions as well as being critical to verifying international
Fourier transform spectrometer

High Resolution Atomic Spectroscopy

Ongoing
For many decades, the Atomic Spectroscopy Group at NIST has measured atomic data of vital use to astronomy and other fields using high resolution spectrometers that are found in few other places in the world. These include a 2-m path difference Fourier transfer (FT)spectrometer, a vacuum ultraviolet

High-Sensitivity IR Spectroscopy of Proteins

Ongoing
Infrared (IR) absorption spectroscopy has been widely used as a non-invasive, label-free characterization method of chemical identification and structure for complex biomolecules. Conventional IR spectroscopy, e.g., Fourier-transform IR (FT-IR) technology, can characterize proteins and other
EUV Relectivity

Metrology for extreme ultraviolet lithography

Ongoing
Patterning with light 13 nm brings a host a new challenges Light at 13 nm is well within the vacuum ultraviolet, where radiation is strongly absorbed by all materials. This requires that the technology take place in vacuum and rely on mirrors rather than lenses. Moreover generating sufficient
molecular physiology illustration

Molecular Physiology

Ongoing
In close collaboration with experimentalists, we are seeking to increase the resolution, scope, and throughput of single-biomolecule and ensemble techniques, such as nanopore-based biomolecular analysis, ultrafast vibrational spectroscopy, and FRET, among others. These developments rely heavily on