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Search Publications by: Edwin J. Heilweil (Assoc)

Displaying 151 - 175 of 261

Comparative OHD-RIKES and THz-TDS Probes of Ultrafast Structural Dynamics in Molecular Liquids

October 1, 2004

Author(s)

M C. Beard, W T. Lotshaw, Timothy M. Korter, Edwin J. Heilweil, D McMorrow

We compare terahertz time-domain (THz-TDS) and optical heterodyne detected Raman-induced Kerr effect (OHD-RIKES) spectroscopic techniques as probes of molecular and vibrational dynamics in the frequency range 0.1 THz to 6 THz (3 cm-1 to 200 cm-1). The

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, 350 fs electron injection from (4,4'dcb) 2Ru(NCS) 2 (1) and (5,5'dcb) 2Ru(NCS) 2 (2) to nanostructured TiO 2 electrodes. (4,4'dcb) = (4,4'-COOH-2,2'-bipyridine)} Although rapid, the injection from 2