Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Journals

Generalized Pseudo-Potentials for Higher Partial Wave Scattering

October 12, 2021

Author(s)

R Stock, A Silberfarb, I H. Deutsch, E L. Bolda

We derive a generalized zero-range pseudo-potential applicable to all partial wave solutions to the Schrodinger equation based on a delta-shell potential in the...

Blackbody Radiation Shift in a ⁴³Ca⁺ Ion Optical Frequency Standard

October 12, 2021

Author(s)

B Arora, M S. Safronova, Charles W. Clark

Motivated by the prospect of an optical frequency standard based on 43Ca+, we calculate the blackbody radiation (BBR) shift of the 4s1/2 - 3d5/2 clock...

Carrier-Pulse Envelope Dynamics in Passively Mode-Locked Ti:Sapphire Lasers

October 12, 2021

Author(s)

K W. Holman, R J. Jones, A Marian, S T. Cundiff, Jun Ye

We have performed systematic studies of intensity-related dynamics of the pulse repetition and carrier-envelope offset frequency in passively mode-locked Ti...

Active Synchronization and Carrier Phase Locking of Two Separate Mode-Locked Femtosecond Lasers

October 12, 2021

Author(s)

R K. Shelton, L -. Ma, H C. Kapteyn, M M. Murnane, J L. Hall, Jun Ye

Two independent mode-locked femtosecond lasers are synchronized to an unprecedented precision. The rms timing jitter between the lasers is 4.3 fs observed...

Tight-Binding Method and Multiband Effective Mass Theory Applied to CdS Nanocrystals: Single-Particle Effects and Optical Spectra Fine Structure

October 12, 2021

Author(s)

J G. Diaz-Garcia, J Planelles, Garnett W. Bryant, Javier Aizpurua

Optical spectra of CdS nanocrystals are interpreted by using both the atomistic tight-binding method and multiband effective-mass theory. Both methods correctly...

Investigation of Different Growth Steps in the Preparation of Layer-by-Layer Self-Assembled Films by Second Harmonic Generation

October 12, 2021

Author(s)

M Breit, M Gao, G von Plessen, J Lemmer, J Feldman, Steven T. Cundiff

Second harmonic generation (SHG) is used to investigate various growth steps in the preparation of layer-by-layer self-assembled films of oppositely charged...

A High-Field, Low-Current Superconducting Ioffe Magnetic Trap

October 12, 2021

Author(s)

S N. Dzhosyuk, C R. Brome, J S. Butterworth, P R. Huffman, C E. Mattoni, D N. McKinsey, R A. Michniak, L Yang, John M. Doyle

A superconducting Ioffe magnetic trap is designed, built and characterized. The trap consists of four racetrack-shaped quadrupole coils and two solenoid...

Improved Transition Oscillator Probabilities for Laser Transitions in Xe I

October 12, 2021

Author(s)

Abhijit Dasgupta, J P. Apruzes, O Zatsarinny, K Bartschat, Charlotte F. Fischer

The atomic xenon laser is among the most efficient and powerful of thenear-infrared gas lasers, especially when pumped by molecular ions in an Ar-Xemixture...

Excited Thomas-Efimov Levels in Ultracold Gases

October 12, 2021

Author(s)

M D. Lee, T Koehler, Paul S. Julienne

Since the early days of quantum physics, the complex behavior of three interacting particles has been the subject of numerous experimental and theoretical...

Kinetic Theory of a Spin-1/2 Bose-Condensed Gas

October 12, 2021

Author(s)

T Nikuni, J E. Williams

We derive a kinetic theory for a spin-1/2 Bose-condensed gas of two-level atoms at finite temperatures. The condensate dynamics is described by a generalized...

Third-Order Relativistic Many-Body Calculations of Energies and Lifetimes of Levels Along the Silver Isoelectronic Sequence

October 12, 2021

Author(s)

U I. Safronova, I Savukov, M S. Safronova, W R. Johnson

Energies of 5lj (l = s, p, d, f, g) and 4fj states in neutral Ag and Ag-like ions with nuclear charges Z = 48 - 100 are calculated using relativistic many-body...

Electron-Phonon Scattering in Quantum Wires Exposed to a Perpendicular Magnetic Field

October 12, 2021

Author(s)

M Aghasyan, S M. Badalyan, Garnett W. Bryant

A theory of test electron and electron temperature relaxation in quantum wires due to acoustical and optical phonon scattering is presented. The intra- and...

Radon Progeny Microdosimetry in Human and Rat Bronchial Airways: The Effect of Crossfire From the Alveolar Region

October 12, 2021

Author(s)

H Fakir, W Hofmann, Randall S. Caswell

The objectives of the present study wee (i) to present a comprehensive analysis of the microdosimetric quantities in both human and rat bronchial airways and...

A NLTE analysis of the ζ Aurigae B-type secondary I. Determination of the fundamental stellar parameters

October 12, 2021

Author(s)

P D. Bennett, A Brown, J L. Linsky

We present a model atmosphere analysis of the B star secondary of ζ Aurigae (B5 V+K4Ib), and determine its stellar parameters. A grid of model atmospheres and...

Measurement of Thermophysical Properties for Future Development of Cryogenic Radiometers

October 12, 2021

Author(s)

Z M. Zhang, Steven R. Lorentz, Joseph P. Rice, Raju V. Datla

We have measured the thermal conductivity of polyimide at temperatures from 2.4 K to 8 K, and specific heats of polyimide and a black paint at 2.4 K and 4.4 K...

Multiquantum vibrational deactivation of N₂+(V) by collisions with N₂ and O₂ at thermal energy

October 12, 2021

Author(s)

S Kato, V M. Bierbaum, S R. Leone

Vibrational deactivation and charge transfer in the collisions of N 2+(v=0-4) with N 2 and O 2 are studied at thermal energy. State-specific rate constants for...

Design and Evaluation of Large Aperture Gallium Fixed Point Blackbody

October 12, 2021

Author(s)

V B. Khromchenko, Sergey Mekhontsev, Leonard Hanssen

To complement existing water bath blackbodies which are now serving as NIST primary standard sources in the temperature range from 15 C to 75 C, a gallium fixed...

Photon Echoes in Disordered Semiconductor Quantum Wells

October 12, 2021

Author(s)

D G. Steel, Steven T. Cundiff

Photon echo spectroscopy provides an important tool for studying excitonic relaxation in disordered quantum wells. Localization of excitons due to interface...

Coherent Raman Spectra of the v₁ Mode of ¹⁰BF₃ and ¹¹BF₃

October 12, 2021

Author(s)

Robynne Kirkpatrick, Tony Masiello, Alfons Weber, J Nibler

High resolution (0.001cm-1) coherent anti-Stokes Raman spectroscopy (CARS) was used to directly examine the n1 symmetric stretching mode of the planar symmetric...

Non-Contact Tuning Fork Position Sensing for Hollow-Pyramid Near-Field Cantilevered Probes

October 12, 2021

Author(s)

A Ambrosio, E Cafali, S Spadaro, S Patane, Maria Allegrini, D Albert, E Oesterschulze

We demonstrate that tuning fork sensing provides a stable non-contact mode operation when applied to near-field optical microscopy employing cantilevered probes...

Two-Color Photoassociation Spectroscopy of Ytterbium Atoms and the Precise Determinations of s-Wave Scattering Lengths

October 12, 2021

Author(s)

M Kitagawa, K Enomoto, K Kasa, Yasuo Takahashi, R Ciurylo, Pascal Naidon, Paul S. Julienne

By performing high-resolution two-color photoassociation spectroscopy, we have successfully de-termined the binding energies of several of the last bound states...

Radio-Frequency Output Coupling of the Bose-Einstein Condensate in Atom Lasers

October 12, 2021

Author(s)

Y B. Band, Paul S. Julienne, M Trippenbach

Experiments have conclusively demonstrated coherence properties of Bose-Einstein condensates [BECs] [1] and the radio-frequency [rf] radiation output coupling...

Final-State Rule vs. the Bethe-Salpeter Equation for Deep-Core X-ray Absorption Spectra

October 12, 2021

Author(s)

J J. Rehr, J A. Soininen, Eric L. Shirley

The independent-electron approximation together with the final-state rule provides a well established method for calculating x-ray absorption spectra that takes...

Strain Effects on the Electronic Structure of Strongly Coupled Self-Assembled InAs/GaAs Quantum Dots: Tight-Binding Approach

October 12, 2021

Author(s)

W Jaskolski, M Zielinski, Garnett W. Bryant, Javier Aizpurua

We present an atomistic tight-binding study of the electronic structure and optical properties of vertically stacked, double, self-assembled, InAs/GaAs quantum...

The Spectrum of Th-Ar Hollow Cathode Lamps in the 900 nm to 4500 nm Region: Establishing Wavelength Standards for the Calibration of VLT Spectrographs

October 12, 2021

Author(s)

F Kerber, Gillian Nave, Craig J. Sansonetti

We report new observations of the infra-red (IR) spectrum of low current Th-Ar hollow cathode lamps with the 2-m Fourier transform spectrometer (FTS) at the...

Strain and Spin-Orbit Effects in Self-Assembled Quantum Dots

October 12, 2021

Author(s)

M Zielinski, W Jaskolski, Javier Aizpurua, Garnett W. Bryant

The effects of strain and spin-orbit interaction in self-assembled lens-shaped InAs/GaAs quantum dots are investigated. Calculations are performed with...

Laser Based Angle-Resolved Photoemission, the Sudden Approximation and Quasiparticle-Like Spectral Peaks in Bi₂Sr₂Cu₂O₈+Δ

October 12, 2021

Author(s)

j D. Koralek, Jack F. Douglas, N C. Plumb, Z Sun, A V. Fedorov, M M. Murnane, H C. Kapteyn, Steven T. Cundiff, Y Aiura, K Oka, H. Eisaki, D S. Dessau

A new low photon energy regime of angle-resolved photoemission spectroscopy is accessed with lasers and used to study the hight T c superconductor Bid2^CaCu 2O...

Precision Study of 6p ²P_j->8s ² S_1/2 Relative Transition Matrix Elements in Atomic Cs

October 12, 2021

Author(s)

A Sieradzan, M D. Havey, M S. Safronova

A combined experimental and theoretical study of transition matrix elements of the 6s 2S 1/2-> 6p 2P j-> 8s 2S 1/2 transition in atomic Cs is reported...

The Goddard High Resolution Spectrograph: In-Orbit Performance

October 12, 2021

Author(s)

S R. Heap, J L. Linsky

The in-orbit performance of the Goddard High Resolution Spectrograph onboard the Hubble Space Telescope (HST) is presented. This report covers the pre-COSTAR...

Redefinition of the Kilogram, Ampere, Kelvin and Mole: A Proposed Approach to implementing CIPM Recommendation 1 (C1-2005)

October 12, 2021

Author(s)

I M. Mills, Peter Mohr, T J. Quinn, Barry Taylor, Edwin R. Williams

The International System of Units (SI) is founded on the seven base units metre, kilogram, second, ampere, kelvin, mole and candela corresponding to the seven...

Was this page helpful?