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Search Publications by: Edwin J. Heilweil (Fed)

Displaying 76 - 100 of 130

Femtosecond Infrared Coherent Excitation of Liquid Phase Vibrational Population Distributions (v [greater than] 5)

July 1, 2004

Author(s)

T Witte, J S. Yeston, Edwin J. Heilweil, K L. Kompa, M Motzkus

Irradiation of a hexane solution of W(CO)6 with femtosecond mid-IR pulses, resonant with the transition energies for the first seven steps in the anharmonic potential of the T1u CO-stretch, has transferred vibrational population up to at least v = 6. The

Ultrafast Chelation Dynamics of Cyclopentadienyl Manganese Tricarbonyl Derivatives with Pendant Sulfides

April 1, 2004

Author(s)

J S. Yeston, Edwin J. Heilweil, T T. To, Theodore J. Burkey

The photoinduced dynamics of two new [h5-C5H4C(O)R]Mn(CO)3 complexes 2 (R = CH(SCH3)2) and 3 (R = C(SCH3)3) have been investigated in n-heptane solution on the ps to us timescale by UV-pump IR-probe transient absorption spectroscopy. Irradiation of 2 at

Noninvasive Detection of Weapons of Mass Destruction Using Terahertz Radiation

July 1, 2003

Author(s)

M B. Campbell, Edwin J. Heilweil

The growing and immediate threat of biological and chemical weapons has placed urgency on the development of chemical and biological warfare agent (CWA/BWA) and explosive material screening devices. Specifically, the ability to detect CWA/BWA or explosives

Terahertz Spectroscopy of Short-Chain Polypeptides

July 1, 2003

Author(s)

M R. Kutteruf, Craig Brown, L K. Iwaki, M B. Campbell, Timothy M. Korter, Edwin J. Heilweil

Terahertz (THz) absorption and neutron vibrational spectra for solid-phase short-chain peptide sequences at 77 K and 298 K are reported. We demonstrate that a high degree of spectral and structural information exists for these systems in the 1 THz to 15

Non-Invasive Detection of Weapons of Mass Destruction Using Thz Radiation

January 1, 2003

Author(s)

M J. Campbell, Edwin J. Heilweil

Vibrational Population Control in Liquid-Phase Metal Carbonyls

June 1, 2002

Author(s)

V D. Kleiman, Joseph S. Melinger, Edwin J. Heilweil

Broadband picosecond and femtosecond mid-infrared chirped-pulse excitation with broadband probe techniques are being explored at NIST using multi-element, mid-infrared focal plane array detectors. Ultrafast infrared chirped IR pulse generation, detection

Applications of Ultrafast Transient Infrared Spectroscopies

May 1, 2002

Author(s)

T Heimer, Edwin J. Heilweil

Modern techniques for performing ultrafast transient mid-infrared spectroscopy using turnable, broadband infrared probe pulses with multi-channel CCD and infrared focal plane array detection is presented. Novel application of these picosecond and

Applications of Ultrafast Transient Infrared Spectroscopies, ed. by H. Hamaguchi

January 1, 2002

Author(s)

T Heimer, Edwin J. Heilweil

Vibrational Population Control in Liquid - Phase Metal Carbonyls, ed. by Abderrazzak Douhal and Jesus Santamaria

January 1, 2002

Author(s)

V D. Kleiman, J S. Melinger, Edwin J. Heilweil

Applications of Broadband Transient Infrared Spectroscopy, ed. by M.D. Fayer

January 1, 2001

Author(s)

Edwin J. Heilweil

Ultrafast Terahertz Spectroscopy: Measuring Low-Frequency Vibrational Modes of Hydrogen-Bonded Systems

July 1, 2000

Author(s)

D A. McWhorter, Alan L. Migdall, Edwin J. Heilweil

An ultrafast terahertz spectrometer using ZnTe crystals for optical rectification and free-space electro-optic sampling has been developed to measure vibrational dynamics of biological molecules. Spectrometer characteristics and absorption spectra of

Electron Injection, Recombination and Halide Oxidation Dynamics at Dye-Sensitized Metal Oxide Interfaces

May 1, 2000

Author(s)

T Heimer, Edwin J. Heilweil, C A. Bignozzi, G J. Meyer

Time-resolved infrared measurements indicate ultrafast,

Pulsed Terahertz Spectroscopy of DNA, Bovine Serum Albumin and Collagen Between 0.1 and 2.0 THz

March 1, 2000

Author(s)

A G. Markelz, A. E. Roitberg, Edwin J. Heilweil

We report the first use of pulsed terahertz spectroscopy to examine low frequency collective vibrational modes of biomolecules. Several absorption features were observed for pressed pellets of calf thymus DNA, bovine serum albumin and collagen in the 0.06

Electron Injection, Recombination and Halide Oxidation Dynamics at Dye-sensitized Metal Oxide Interfaces

January 1, 2000

Author(s)

T A. Heimer, Edwin J. Heilweil, C A. Bignozzi, G J. Meyer

Growth Inhibition and Transient Temperature Measurement of Laser-Irradiated Hair Fibers and Follicles

January 1, 2000

Author(s)

L K. Iwaki, T Heimer, Edwin J. Heilweil, P A. Manos

Temperature changes, infrared (IR) images, and heat propagation kinetics of laser irradiated hair fibers and live follicles were measured using a cooled InSb focal plane array detector. Pulsed irradiation of different colored hair follicles under

Ultrafast Glimpses at Water and Ice

March 1, 1999

Author(s)

Edwin J. Heilweil

Recent literature reports of transient infrared hole-burning and spectroscopic measurements on water and ice are critically reviewed. Dynamical measurements on the femtosecond and picosecond timescales show anomalous vibrational relaxation temperature

Infrared Spectral Hole Burning of 1:1 Hydrogen-Bonded Complexes in Solution

January 1, 1999

Author(s)

S M. Arrivo, V D. Kleiman, W T. Grubbs, T P. Dougherty, Edwin J. Heilweil

Terahertz Spectral Measurements of DNA Oligomers

January 1, 1999

Author(s)

Alan L. Migdall, Edwin J. Heilweil

Ultrafast Microdynamics of Water and Ice

January 1, 1999

Author(s)

Edwin J. Heilweil

Ultrafast Ring Closure Energetics and Dynamics of Cyclopentadienyl Manganese Tricarbonyl Derivatives

January 1, 1999

Author(s)

T Jiao, Zhiyu Pang, T J. Berkey, R F. Johnston, T A. Heimer, V D. Keiman, Edwin J. Heilweil

Control of Condensed Phase Molecular Excitation With Intense Infrared and Visible Chipped Pulses

October 21, 1998

Author(s)

V D. Kleiman, Edwin J. Heilweil, D McMorrow, Joseph S. Melinger

Chirped ultrafast laser pulses in the mid-Infrared and visible are used to experimentally control population transfer in condensed-phase systems and molecules.

Energetics and Ultrafast Ring Closure Dynamics of Cyclopentadienyl Manganese Tricarboyl Derivatives

September 1, 1998

Author(s)

T Jiao, Zhiyu Pang, Theodore J. Burkey, R F. Johnston, T Heimer, V D. Kleiman, Edwin J. Heilweil

Ring closures following flash photolysis in alkane solvents has been detected for several complexes in the series η 5-C 5H 4R)Mn(CO) 3 where R = COCH 3 (1), COCH 2SCH 3 (2), CO(CH 2) 2SCH 3 (3), COCH 2OCH 3 (4), (CH 2) 2CO 2CH 3 (5), and CH 2CO 2CH 3 (6)

Temperature Dependent Terahertz Output from Semi-Insulating GaAs Photoconductive Switches

May 1, 1998

Author(s)

A G. Markelz, Edwin J. Heilweil

The temperature dependence of the terahertz (THz) output power and spectra from biased photoconductive switches was measured for several antenna gap widths and applied biases. The spectrally integrated THz output had a nonmonotonic temperature dependence

Control of Condensed-phase Molecular Excitation with Intense Infrared and Visible Chirped Pulses

January 1, 1998

Author(s)

V D. Kleiman, Edwin J. Heilweil, D Mcmorrow, J S. Melinger

Controlling Condensed-phase Vibrational Excitation with Tailored Infrared Pulses, Special issue on 'Coherence in Chemical Dynamics,'

January 1, 1998

Author(s)

V D. Kleiman, S M. Arrivo, J S. Melinger, Edwin J. Heilweil