C. Michael Lindsay
Air Force Research Laboratory
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Publication
Featured researches published by C. Michael Lindsay.
Journal of Chemical Physics | 2009
Mario E. Fajardo; C. Michael Lindsay; Takamasa Momose
We report the first rotationally resolved and completely assigned rovibrational spectrum for a nonhydride molecule rotating in the solid phase: carbon monoxide (CO) monomers isolated in cryogenic solid parahydrogen (p-H(2)). We employ a modified crystal field theory model, in which the CO molecular spectroscopic constants are taken as adjustable parameters, to make good spectroscopic assignments for all the observed features. We discuss the limitations of this approach and highlight the need for improved theoretical models of molecular rotation dynamics in quantum solids.
Journal of Chemical Physics | 2013
Samuel B. Emery; Keith B. Rider; Brian K. Little; C. Michael Lindsay
Atomic and molecular clusters are a unique class of substances with properties that differ greatly from those of the bulk or single atoms due to changes in surface to volume ratio and finite size effects. Here, we demonstrate the ability to create cluster matter films using helium droplet mediated cluster assembly and deposition, a recently developed methodology that condenses atoms or molecules within liquid helium droplets and then gently deposits them onto a surface. In this work, we examine magnesium nanocluster films, which exhibit growth behavior comparable to low-energy cluster beam methods, and demonstrate physical properties and morphology dependent on helium droplet size.
Review of Scientific Instruments | 2013
Christopher Molek; C. Michael Lindsay; Mario E. Fajardo
We describe the design, construction, and operation of a novel apparatus for investigating efficiency improvements in thin-film cryogenic solid positron moderators. We report results from solid neon, argon, krypton, and xenon positron moderators which illustrate the capabilities and limitations of our apparatus. We integrate a matrix isolation spectroscopy diagnostic within a reflection-geometry positron moderation system. We report the optical thickness, impurity content, and impurity trapping site structures within our moderators determined from infrared absorption spectra. We use a retarding potential analyzer to modulate the flow of slow positrons, and report positron currents vs. retarding potential for the different moderators. We identify vacuum ultraviolet emissions from irradiated Ne moderators as the source of spurious signals in our channel electron multiplier slow positron detection channel. Our design is also unusual in that it employs a sealed radioactive Na-22 positron source which can be translated relative to, and isolated from, the cryogenic moderator deposition substrate. This allows us to separate the influences on moderator efficiency of surface contamination by residual gases from those of accumulated radiation damage.
SHOCK COMPRESSION OF CONDENSED MATTER - 2015: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter | 2017
C. Michael Lindsay; Mario E. Fajardo
It is well known that the performance of modern energetic materials based on organic chemistry has plateaued, with only ∼ 40% improvements realized over the past half century. This fact has stimulated research on alternative chemical energy storage schemes in various U.S. government funded “High Energy Density Materials” (HEDM) programs since the 1950’s. These efforts have examined a wide range of phenomena such as free radical stabilization, metallic hydrogen, metastable helium, polynitrogens, extended molecular solids, nanothermites, and others. In spite of the substantial research investments, significant improvements in energetic material performance have not been forthcoming. This paper discusses the lessons learned in the various HEDM programs, the different degrees of freedom in which to store energy in materials, and the fundamental limitations and orders of magnitude of the energies involved. The discussion focuses almost exclusively on the topic of energy density and only mentions in passing other equally important properties of explosives and propellants such as gas generation and reaction rate.It is well known that the performance of modern energetic materials based on organic chemistry has plateaued, with only ∼ 40% improvements realized over the past half century. This fact has stimulated research on alternative chemical energy storage schemes in various U.S. government funded “High Energy Density Materials” (HEDM) programs since the 1950’s. These efforts have examined a wide range of phenomena such as free radical stabilization, metallic hydrogen, metastable helium, polynitrogens, extended molecular solids, nanothermites, and others. In spite of the substantial research investments, significant improvements in energetic material performance have not been forthcoming. This paper discusses the lessons learned in the various HEDM programs, the different degrees of freedom in which to store energy in materials, and the fundamental limitations and orders of magnitude of the energies involved. The discussion focuses almost exclusively on the topic of energy density and only mentions in passing oth...
Journal of Chemical Physics | 2008
Mario E. Fajardo; C. Michael Lindsay
Physical Review Letters | 2001
Takamasa Momose; C. Michael Lindsay; Yu Zhang; Takeshi Oka
Propellants, Explosives, Pyrotechnics | 2015
Brian K. Little; Samuel B. Emery; Joshua C. Nittinger; Ryan C. Fantasia; C. Michael Lindsay
Propellants, Explosives, Pyrotechnics | 2013
Keith B. Rider; Brian K. Little; Samuel B. Emery; C. Michael Lindsay
Propellants, Explosives, Pyrotechnics | 2014
Samuel B. Emery; Keith B. Rider; C. Michael Lindsay
Journal of Physical Chemistry C | 2013
Samuel B. Emery; Keith B. Rider; Brian K. Little; C. Michael Lindsay