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Search Publications by: David F. Plusquellic (Fed)

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Displaying 51 - 75 of 243

Frequency-agile, rapid scanning spectroscopy

April 28, 2013
Author(s)
Gar W. Truong, Kevin O. Douglass, Stephen E. Maxwell, Roger D. van Zee, David F. Plusquellic, Joseph T. Hodges, David A. Long
Challenging applications in trace gas analyses require high precision and acquisition rates.1-4 Many continuous-wave laser spectroscopy techniques exhibit significant sensitivity and potential;5 however, their scanning rates are slow because they rely upon

Construction of a High Power OPO Laser system for Differential Absorption LIDAR

September 13, 2011
Author(s)
Kevin O. Douglass, Stephen E. Maxwell, David F. Plusquellic, Joseph T. Hodges, Roger D. van Zee, Daniel V. Samarov, James R. Whetstone
Our goal is to develop and characterize optical measurement technology to enable accurate quantification of greenhouse-gas emissions to meet the needs of industry and regulators. A 1064 nm pumped high energy optical parametric oscillator (OPO) operating

On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase.

September 1, 2011
Author(s)
Leonardo Avarez-Valtierra, David F. Plusquellic, John T. Yi, David W. Pratt
Rotationally resolved fluorescence excitation spectroscopy has been used to study the dynamics, electronic distribution, and the relative orientation of the transition moment vector in several vibronic transitions of acenaphthene (ACN) and in its Ar van

Rotationally Resolved C2 Symmetric Conformers of Bis-(4-hydroxyphenyl)methane: Textbook Examples of Excitonic Coupling in the S1 and S2 Electronic States

September 1, 2011
Author(s)
Shin G. Chou, Chirantha P. Rodrigo, Christian Muller, Kevin O. Douglass, Timothy Zwier, David F. Plusquellic
Rotationally resolved microwave and ultraviolet spectra of jet-cooled bis-4 hydroxy)-diphenylmethane (b4HBM) have been obtained using Fourier-transform microwave and UV laser/molecular beam spectrometers. A recent vibronic level study of b4HPM1 has

State Resolved THz Spectroscopy and Dynamics of Crystalline Peptide/Water Systems

July 11, 2011
Author(s)
Zeeshan Ahmed, Shin G. Chou, Karen M. Siegrist, David F. Plusquellic
State resolved THz studies of crystalline peptides and their hydrates have provided precise measures of the infrared active phonon modes that reflect motions on the longest possible length scales in these systems. The impact of co-crystallized water on the

Conformer-specific vibronic spectroscopy and vibronic coupling in a flexible bichromophore: bis-(4-hydroxyphenyl)methane

April 28, 2011
Author(s)
Chirantha P. Rodrigo, Christian Muller, Nathan Pillsbury, William H. James III, David F. Plusquellic, Timothy Zwier
The vibronic spectroscopy of jet-cooled bis-(4-hydroxyphenyl)methane (b4HPM) has been explored using fluorescence excitation (FE), dispersed fluorescence (DFL), UV-UV holeburning (UVHB), UV depletion (UVD), and fluorescence-dip infrared (FDIR)

Chirped-pulse terahertz spectroscopy for broadband trace gas sensing

April 22, 2011
Author(s)
Eyal Gerecht, Kevin O. Douglass, David F. Plusquellic
We report the first demonstration of a broadband trace gas sensor based on chirp-pulse terahertz spectroscopy. The advent of newly developed solid state sources and heterodyne detectors for the terahertz frequency range have made it possible to generate

Organic Compounds in the C3H6O3 Family: Microwave Spectrum of cis-cis-Dimethyl Carbonate

October 18, 2010
Author(s)
Francis J. Lovas, David F. Plusquellic, Susanna L. Widicus Weaver, B. A. McGuire, G. A. Blake
Geometry optimization calculations on 13 members of the C3H6O3 family of organic species have been carried out to determine their relative binding energies. Dimethyl carbonate [(CH3)2CO3] is one of the lower energy species in this family, which includes

International Comparability in Circular Dichroism: II

October 4, 2010
Author(s)
Curtis W. Meuse, Jascindra Ravi, Paulina Rakowska, Tommaso Garfagnini, Alex E. Knight, Philippe Charlet, Julie D. Lorenz, Christopher Jones, David F. Plusquellic, Frank Wien, Liqing Wu
A previous inter-laboratory study, CCQM P59, showed that there was a poor level of comparability between laboratories in circular dichroism spectroscopy. In a follow-up study reported here, we achieved our goal of demonstrating improved comparability and