Search Results - "Michelsen, HA"

Soot precursor formation and limitations of the stabilomer grid by Johansson, K.O., Lai, J.Y.W., Skeen, S.A., Popolan-Vaida, D.M., Wilson, K.R., Hansen, N., Violi, A., Michelsen, H.A.

“…We have combined experimental and theoretical approaches to gain new insight into the mechanisms of PAH growth and soot formation. The experimental approach…”
Get full text

Stratospheric water vapor increases over the past half-century by Rosenlof, K. H., Oltmans, S. J., Kley, D., Russell, J. M., III, Chiou, E.-W., Chu, W. P., Johnson, D. G., Kelly, K. K., Michelsen, H. A., Nedoluha, G. E.

“…Ten data sets covering the period 1954-2000 are analyzed to show a 1% per year increase in stratospheric water vapor. The trend has persisted for at least 45…”
Get full text

Carbon and hydrogen kinetic isotope effects for the reaction of Cl with CH sub(4): Consolidating chemical kinetics and molecular dynamics measurements by Michelsen, HA

“…In order to estimate carbon and hydrogen kinetic isotope effects for the reaction Cl+CH sub(4) at atmospheric temperatures, measured values of the rates of Cl…”
Get full text

Relating State-Dependent Cross Sections to Non-Arrhenius Behavior for the Cl + CH4 Reaction by Michelsen, Hope A, Simpson, William R

“…We have used information gained via differential cross-section experiments of the Cl + CH4 reaction in an analysis of measured thermal rate constants to…”
Get full text

The Reaction of Cl with CH4:  A Connection between Kinetics and Dynamics by Michelsen, Hope A

“…This paper presents an analysis of the reaction of Cl with CH4 by combining measurements of thermal rate constants and state-dependent reaction cross sections…”
Get full text

A laser and molecular beam mass spectrometer study of low-pressure dimethyl ether flames by Mcilroy, Andrew, Hain, Toby D., Michelsen, Hope A., Cool, Terrill A.

“…The oxidation of dimethyl ether (DME) was studied in low-pressure, premixed flames using a new molecular beam mass spectrometer (MBMS) and laser diagnosties…”
Get full text

A parameterization for the activity of H super(+) in aqueous sulfuric acid solutions by Michelsen, HA

“…Recent studies have suggested that the rates of reactions that occur on and in sulfuric acid solutions depend strongly on the activities of H sub(2) O and H…”
Get full text

Carbon and hydrogen kinetic isotope effects for the reaction of Cl with CH4: Consolidating chemical kinetics and molecular dynamics measurements by Michelsen, H. A.

“…In order to estimate carbon and hydrogen kinetic isotope effects for the reaction Cl+ CH4 at atmospheric temperatures, measured values of the rates of Cl…”
Get full text

Role of vibrational and translational energy in the activated dissociative adsorption of D2 on Cu(111) by RETTNER, C. T, AUERBACH, D. J, MICHELSEN, H. A

Get full text

Features and trends in Atmospheric Trace Molecule Spectroscopy (ATMOS) version 3 stratospheric water vapor and methane measurements by Michelsen, H. A., Irion, F. W., Manney, G. L., Toon, G. C., Gunson, M. R.

“…Mixing ratios of water vapor entering the stratosphere are inferred from Atmospheric Trace Molecule Spectroscopy (ATMOS) measurements to be 3.28 ppm in 1985,…”
Get full text

Polar vortex dynamics during spring and fall diagnosed using trace gas observations from the Atmospheric Trace Molecule Spectroscopy instrument by Manney, G. L., Michelsen, H. A., Santee, M. L., Gunson, M. R., Irion, F. W., Roche, A. E., Livesey, N. J.

“…Trace gases measured by the Atmospheric Trace Molecule Spectroscopy (ATMOS) instrument during three Atmospheric Laboratory for Applications and Science (ATLAS)…”
Get full text

State-specific dynamics of D2 desorption from Cu(111) : the role of molecular rotational motion in activated adsorption-desorption dynamics by MICHELSEN, H. A, RETTNER, C. T, AUERBACH, D. J

Get full text

Correlations of stratospheric abundances of CH4 and N2O derived from ATMOS measurements by Michelsen, H. A., Manney, G. L., Gunson, M. R., Rinsland, C. P., Zander, R.

“…ATMOS measurements made over a wide range of altitudes and latitudes demonstrate compact correlations between mixing ratios of CH4 and N2O. Tight but distinct…”
Get full text

Comparison of satellite ozone observations in coincident air masses in early November 1994 by Manney, G. L., Michelsen, H. A., Bevilacqua, R. M., Gunson, M. R., Irion, F. W., Livesey, N. J., Oberheide, J., Riese, M., Russell, J. M., Toon, G. C., Zawodny, J. M.

“…Ozone observed by seven satellite instruments, the Atmospheric Trace Molecule Spectroscopy instrument (ATMOS), Stratospheric Aerosol and Gas Experiment (SAGE)…”
Get full text

Lamination and polar vortex development in fall from ATMOS long-lived trace gases observed during November 1994 by Manney, G. L., Michelsen, H. A., Irion, F. W., Toon, G. C., Gunson, M. R., Roche, A. E.

“…Long‐lived trace‐gas profiles observed by the Atmospheric Trace Molecule Spectroscopy (ATMOS) instrument around the developing polar vortex (the “protovortex”)…”
Get full text

Assessment of the SAGE II version 6.2 water vapor data set through intercomparison with ATMOS/ATLAS-3 measurements by Chiou, Er-Woon, Thomason, Larry W., Burton, Sharon P., Michelsen, Hope A.

“…Based on the intercomparisons with ATMOS/ATLAS‐3 measurements, the SAGE II (Stratospheric Aerosol and Gas Experiment II) version 6.2 water vapor profiles…”
Get full text

A parameterization for the activity of H+ in aqueous sulfuric acid solutions by Michelsen, H. A.

“…Recent studies have suggested that the rates of reactions that occur on and in sulfuric acid solutions depend strongly on the activities of H2O and H+. To…”
Get full text

Observation of direct vibrational excitation in collisions of H2 and D2 with a Cu(111) surface by RETTNER, C. T, AUERBACH, D. J, MICHELSEN, H. A

Get full text

Aerosol-mediated partitioning of stratospheric CL sub(y) and NO sub(y) at temperatures above 200 K by Michelsen, HA, Spivakovsky, C M, Wofsy, S C

“…Rates of aerosol-mediated reactions involving inorganic halogen species are small but non-negligible for moderate aerosol abundances at temperatures of 200-210…”
Get full text

Assessing the Contribution of the Lowest Triplet State to the Near-UV Absorption Spectrum of HOCl by Barnes, Rhett James, Sinha, Amitabha, Michelsen, Hope A

“…The near-UV absorption spectrum of HOCl is examined using laser induced fluorescence to monitor OH fragments resulting from photodissociation. The measured…”
Get full text