116 citations · 446 across the 18 of their papers we have counts for
19 papers
Compact Blackbody Radiation Atomic Sensor: Measuring Temperature using Optically Excited Atoms in Vapor Cells
David S. La Mantia, Mingxin Lei, Nikunjkumar Prajapati +6
We demonstrate a blackbody radiation thermometer based on optically excited rubidium atoms in a vapor cell. The temperature measurement is fast, with statistical uncertainty as low…
On the effect of "glancing" collisions in the cold atom vacuum standard
Stephen P. Eckel, Daniel S. Barker, James A. Fedchak +3
We theoretically investigate the effect of ``glancing" collisions on the ultra-high vacuum (UHV) pressure readings of the cold atom vacuum standard (CAVS), based on either ultracol…
Accurate measurement of the loss rate of cold atoms due to background gas collisions for the quantum-based cold atom vacuum standard
Daniel S. Barker, James A. Fedchak, Jacek Kłos +4
We present measurements of thermalized collisional rate coefficients for ultra-cold Li and Rb colliding with room-temperature He, Ne, N, Ar, Kr, and Xe. In our exper…
Comparison of two multiplexed portable cold-atom vacuum standards
Lucas H. Ehinger, Bishnu P. Acharya, Daniel S. Barker +4
We compare the vacuum measured by two portable cold-atom vacuum standards (pCAVS) based on ultracold Li atoms. The pCAVS are quantum-based standards that use a priori scatterin…
A constant pressure flowmeter for extreme-high vacuum
S. Eckel, D. S. Barker, J. Fedchak +3
We demonstrate operation of a constant-pressure flowmeter capable of generating and accurately measuring flows as low as mol/s. Generation of such small flows is…
Stability of bakeable capacitance diaphragm gauges
Julia Scherschligt, Daniel Barker, Stephen Eckel +2
Here, we study the stability of capacitance diaphragm gauges. We focus on their stability before and after a controlled series of bakes. We find that baking results in appreciable…
PyLCP: A python package for computing laser cooling physics
S. Eckel, D. S. Barker, E. B. Norrgard +1
We present a python object-oriented computer program for simulating various aspects of laser cooling physics. Our software is designed to be both easy to use and adaptable, allowin…
Outgassing rate comparison of seven geometrically similar vacuum chambers of different materials and heat treatments
James A. Fedchak, Julia K. Scherschligt, Sefer Avdiaj +5
We have measured the water and hydrogen outgassing rates of seven vacuum chambers of identical geometry but constructed of different materials and heat treatments. Chambers of five…
A Bitter-type electromagnet for complex atomic trapping and manipulation
J. L. Siegel, D. S. Barker, J. Fedchak +2
We create a pair of symmetric Bitter-type electromagnet assemblies capable of producing multiple field configurations including uniform magnetic fields, spherical quadruple traps,…
A radiofrequency voltage-controlled current source for quantum spin manipulation
D. S. Barker, A. Restelli, J. A. Fedchak +2
We present a design for a wide-bandwidth, voltage-controlled current source that is easily integrated with radiofrequency magnetic field coils. Our design uses current feedback to…
Nuclear-Spin Dependent Parity Violation in Optically Trapped Polyatomic Molecules
Eric B. Norrgard, Daniel S. Barker, Stephen P. Eckel +3
We investigate using optically trapped linear polyatomic molecules as probes of nuclear spin-dependent parity violation. The presence of closely spaced, opposite-parity -doub…
Challenges to miniaturizing cold atom technology for deployable vacuum metrology
Stephen Eckel, Daniel S. Barker, James A. Fedchak +3
Cold atoms are excellent metrological tools; they currently realize SI time and, soon, SI pressure in the ultra-high (UHV) and extreme high vacuum (XHV) regimes. The development of…
Quantum-based vacuum metrology at NIST
Julia Scherschligt, James A. Fedchak, Zeeshan Ahmed +10
The measurement science in realizing and disseminating the unit for pressure in the International System of Units (SI), the pascal (Pa), has been the subject of much interest at th…
Light-induced atomic desorption of lithium
D. S. Barker, E. B. Norrgard, J. Scherschligt +2
We demonstrate loading of a Li magneto-optical trap using light-induced atomic desorption. The magneto-optical trap confines up to approximately ato…
Development of a new UHV/XHV pressure standard (cold atom vacuum standard)
Julia Scherschligt, James A Fedchak, Daniel S Barker +4
The National Institute of Standards and Technology has recently begun a program to develop a primary pressure standard that is based on ultra-cold atoms, covering a pressure range…
A 3D-printed alkali metal dispenser
Eric B. Norrgard, Daniel S. Barker, James A. Fedchak +3
We demonstrate and characterize a source of Li atoms made from direct metal laser sintered titanium. The source's outgassing rate is measured to be \,$\rm{Pa}…
Towards Photonics Enabled Quantum Metrology of Temperature, Pressure and Vacuum
Zeeshan Ahmed, Nikolai N. Klimov, Kevin Douglass +5
This chapter presents a brief overview of photonic sensor and standards development that is currently undergoing in the thermodynamic metrology group at NIST in the areas of temper…
High-Temperature Hall Effect in Ga(1-x)Mn(x)As
D. Ruzmetov, J. Scherschligt, David V. Baxter +6
The temperature dependence of the Hall coefficient of a series of ferromagnetic Ga(1-x)Mn(x)As samples is measured in the temperature range 80K < T < 500K. We model the Hall coeffi…
Anisotropic Magnetoresistance in GaMnAs
David V. Baxter, Dmitry Ruzmetov, Julia Scherschligt +4
We have measured the magnetoresistance in a series of GaMnAs samples with 0.033 0.053 for three mutually orthogonal orientations of the applied magnetic fiel…