High Resolution Infrared Spectroscopy in Doped Parahydrogen (pH2) Solids: CO/pH2 - A Molecular Thermometer

Abstract

We have developed an alternative doped solid pH2 preparation technique based on rapid vapor deposition of precooled pH2 gas onto a substrate-in-vacuum at T = 2 K. The resulting millimeters-thick samples are remarkably transparent, even capable of escaping casual visual detection; in sharp contrast to previously described "completely opaque brown-black" vapor deposited hydrogen solids. Our co-deposition geometry enables us to trap dopant species produced by a wide variety of methods, with excellent isolation efficiencies even at dopant concentrations exceeding 100 PPM. The excellent optical properties of our samples permit their spectroscopic interrogation at wavelengths from the vacuum ultraviolet to the mid-IR. The long useful pathlengths enables the detection of low concentration or weakly absorbing species.

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Document Details

Document Type
Technical Report
Publication Date
Apr 11, 2000
Accession Number
ADA408650

Entities

People

  • Mario E. Fajardo
  • Simon Tam

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption
  • Absorption Spectra
  • Air Force
  • Air Force Research Laboratories
  • Climate Change
  • Detection
  • High Resolution
  • Infrared Spectroscopy
  • Military Research
  • Optical Properties
  • Sensitivity
  • Spectra
  • Spectroscopy
  • Temperature Gradients
  • Thermal Conductivity
  • Thermometers
  • Vapor Deposition

Readers

  • Polymer Science and Technology
  • Spectroscopy.
  • Thermal Physics or Thermal Science.