Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations: A direct test for proposed carriers of the unidentified infrared emission bands

Hack Sung Kim; Richard J. Saykally

doi:10.1086/343078

Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations: A direct test for proposed carriers of the unidentified infrared emission bands

Hack Sung Kim^*, Richard J. Saykally

^*Corresponding author for this work

CCSS - Center for Catalysis and Surface Science

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflection system coupled to our "single-photon infrared emission" (SPIRE) spectrometer. This experiment provides for direct comparison of laboratory infrared emission spectra of gaseous ionized PAHs with the " unidentified infrared emission bands " (UIRs), the origin of which is still debated. We present results for the pyrene cation (C₁₆H ₁₀⁺) and the dehydrogenated pyrene cations (C ₁₆H₈⁺ and C₁₆H₆ ⁺) showing general agreement between the corresponding SPIRE bands and UIR features, although it is not a detailed match. We also discuss possible contributions from the pyrene dimer cation (C₁₆H₁₀) ₂⁺.

Original language	English (US)
Pages (from-to)	455-467
Number of pages	13
Journal	Astrophysical Journal, Supplement Series
Volume	143
Issue number	2
DOIs	https://doi.org/10.1086/343078
State	Published - Dec 2002

Keywords

Dust: extinction
ISM: lines and bands
Infrared: ISM
Methods: laboratory
Techniques: spectroscopic
molecular data

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/343078

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title = "Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations: A direct test for proposed carriers of the unidentified infrared emission bands",

abstract = "We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflection system coupled to our {"}single-photon infrared emission{"} (SPIRE) spectrometer. This experiment provides for direct comparison of laboratory infrared emission spectra of gaseous ionized PAHs with the {"} unidentified infrared emission bands {"} (UIRs), the origin of which is still debated. We present results for the pyrene cation (C16H 10+) and the dehydrogenated pyrene cations (C 16H8+ and C16H6 +) showing general agreement between the corresponding SPIRE bands and UIR features, although it is not a detailed match. We also discuss possible contributions from the pyrene dimer cation (C16H10) 2+.",

keywords = "Dust: extinction, ISM: lines and bands, Infrared: ISM, Methods: laboratory, Techniques: spectroscopic, molecular data",

author = "Kim, {Hack Sung} and Saykally, {Richard J.}",

year = "2002",

month = dec,

doi = "10.1086/343078",

language = "English (US)",

volume = "143",

pages = "455--467",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "American Astronomical Society",

number = "2",

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TY - JOUR

T1 - Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations

T2 - A direct test for proposed carriers of the unidentified infrared emission bands

AU - Kim, Hack Sung

AU - Saykally, Richard J.

PY - 2002/12

Y1 - 2002/12

N2 - We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflection system coupled to our "single-photon infrared emission" (SPIRE) spectrometer. This experiment provides for direct comparison of laboratory infrared emission spectra of gaseous ionized PAHs with the " unidentified infrared emission bands " (UIRs), the origin of which is still debated. We present results for the pyrene cation (C16H 10+) and the dehydrogenated pyrene cations (C 16H8+ and C16H6 +) showing general agreement between the corresponding SPIRE bands and UIR features, although it is not a detailed match. We also discuss possible contributions from the pyrene dimer cation (C16H10) 2+.

AB - We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflection system coupled to our "single-photon infrared emission" (SPIRE) spectrometer. This experiment provides for direct comparison of laboratory infrared emission spectra of gaseous ionized PAHs with the " unidentified infrared emission bands " (UIRs), the origin of which is still debated. We present results for the pyrene cation (C16H 10+) and the dehydrogenated pyrene cations (C 16H8+ and C16H6 +) showing general agreement between the corresponding SPIRE bands and UIR features, although it is not a detailed match. We also discuss possible contributions from the pyrene dimer cation (C16H10) 2+.

KW - Dust: extinction

KW - ISM: lines and bands

KW - Infrared: ISM

KW - Methods: laboratory

KW - Techniques: spectroscopic

KW - molecular data

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U2 - 10.1086/343078

DO - 10.1086/343078

M3 - Article

AN - SCOPUS:0036445537

SN - 0067-0049

VL - 143

SP - 455

EP - 467

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 2

ER -

Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations: A direct test for proposed carriers of the unidentified infrared emission bands

Abstract

Keywords

ASJC Scopus subject areas

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