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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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A cryogenic circulating advective multi-pass absorption cell.

M H Stockett1, J E Lawler

  • 1Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706, USA.

The Review of Scientific Instruments
|April 3, 2012
PubMed
Summary
This summary is machine-generated.

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A new cryogenic absorption cell allows spectroscopic study of polycyclic aromatic hydrocarbons (PAHs) under space conditions. This research investigates if PAHs carry diffuse interstellar bands, a key question in astrochemistry.

Area of Science:

  • Astrochemistry
  • Spectroscopy
  • Astrophysics

Background:

  • Polycyclic Aromatic Hydrocarbons (PAHs) are abundant in space.
  • The origin of diffuse interstellar bands (DIBs) remains a significant mystery.
  • PAHs are hypothesized carriers of DIBs, but direct evidence is lacking.

Purpose of the Study:

  • To develop a novel spectroscopic method for studying PAHs under astrophysically relevant conditions.
  • To test the hypothesis that PAHs or their ions are responsible for diffuse interstellar bands.
  • To investigate the gas-phase spectroscopy of PAHs at cryogenic temperatures.

Main Methods:

  • Development of a cryogenic circulating advective multi-pass absorption cell.
  • Utilizing a synchrotron radiation continuum for high-sensitivity absorption spectroscopy.

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  • Employing a radio frequency dielectric barrier discharge for PAH ionization via charge exchange and Penning ionization.

    • Main Results:

    • The absorption cell achieves high sensitivity (10^7 cm^-3) and long path lengths (hundreds of meters).
    • Unexpected PAH clustering at cryogenic temperatures was observed.
    • The system is capable of spectroscopic surveys of various PAHs.

    Conclusions:

    • The developed cryogenic cell is a powerful tool for astrochemistry research.
    • Further investigation is needed to understand PAH clustering and its interstellar implications.
    • The study provides a pathway to test the PAH-DIB carrier hypothesis.