Algorithm for the Calculation of Absorption Coefficient-Pressure Broadened Molecular Transitions

Abstract

This report describes an algorithm for the accelerated computation of the convolution of a Lorentz line shape (pressure broadened) with spectral line data. A computational savings of approximately 10 has been achieved over conventional methods. The Lorentz function has been decomposed into three functions, each of which is convolved independently at optional sampling intervals. Criteria for the determination of the sampling interval of the Lorentz function for a resultant error of 0.1 percent is described. The report contains a listing of the computer program based on the algorithm and sample results in the spectral region 3550 to 3650/cm due to water and carbon dioxide.

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Document Details

Document Type
Technical Report
Publication Date
Jul 22, 1977
Accession Number
ADA047515

Entities

People

  • Francis X. Kneizys
  • James H. Chetwynd Jr
  • Shepard A. Clough

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption
  • Absorption Coefficients
  • Absorption Spectra
  • Algorithms
  • Barometric Pressure
  • Carbon Dioxide
  • Coefficients
  • Computational Science
  • Computations
  • Computer Programs
  • Computers
  • Frequency
  • Low Temperature
  • New York
  • Procedures (Computers)
  • Spectra
  • Spectral Lines

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Calculus or Mathematical Analysis
  • Spectroscopy.