Infrared absorption features for tetrahedral ammonia ice crystals

Robert A. West; Glenn S. Orton; Bruce T. Draine; Earl A. Hubbell

doi:10.1016/0019-1035(89)90170-X

Infrared absorption features for tetrahedral ammonia ice crystals

Robert A. West, Glenn S. Orton, Bruce T. Draine, Earl A. Hubbell

Astrophysical Sciences

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19 Scopus citations

Abstract

We have computed extinction cross sections for 0.5- and 1-μm volume-equivalent radius tetrahedral NH₃ ice crystals with and without nonabsorbing foreign cores to determine how particle shape and composition affect the strength and shape of resonant absorption features at 9.4 and 26 μm. The peak of the resonance is shifted relative to that for spherical particles, the maximum is smaller (except for 1-μ particles at 9.4 μm), and the integrated strength of the absorption falls in approximate proportion to the volume fraction of the core. It appears that small (r < 5 μm) NH₃ particles cannot be the principal component of the Jovian haze in the 300- to 500-mbar region.

Original language	English (US)
Pages (from-to)	220-223
Number of pages	4
Journal	Icarus
Volume	80
Issue number	1
DOIs	https://doi.org/10.1016/0019-1035(89)90170-X
State	Published - Jul 1989

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/0019-1035(89)90170-X

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title = "Infrared absorption features for tetrahedral ammonia ice crystals",

abstract = "We have computed extinction cross sections for 0.5- and 1-μm volume-equivalent radius tetrahedral NH3 ice crystals with and without nonabsorbing foreign cores to determine how particle shape and composition affect the strength and shape of resonant absorption features at 9.4 and 26 μm. The peak of the resonance is shifted relative to that for spherical particles, the maximum is smaller (except for 1-μ particles at 9.4 μm), and the integrated strength of the absorption falls in approximate proportion to the volume fraction of the core. It appears that small (r < 5 μm) NH3 particles cannot be the principal component of the Jovian haze in the 300- to 500-mbar region.",

author = "West, {Robert A.} and Orton, {Glenn S.} and Draine, {Bruce T.} and Hubbell, {Earl A.}",

year = "1989",

month = jul,

doi = "10.1016/0019-1035(89)90170-X",

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T1 - Infrared absorption features for tetrahedral ammonia ice crystals

AU - West, Robert A.

AU - Orton, Glenn S.

AU - Draine, Bruce T.

AU - Hubbell, Earl A.

PY - 1989/7

Y1 - 1989/7

N2 - We have computed extinction cross sections for 0.5- and 1-μm volume-equivalent radius tetrahedral NH3 ice crystals with and without nonabsorbing foreign cores to determine how particle shape and composition affect the strength and shape of resonant absorption features at 9.4 and 26 μm. The peak of the resonance is shifted relative to that for spherical particles, the maximum is smaller (except for 1-μ particles at 9.4 μm), and the integrated strength of the absorption falls in approximate proportion to the volume fraction of the core. It appears that small (r < 5 μm) NH3 particles cannot be the principal component of the Jovian haze in the 300- to 500-mbar region.

AB - We have computed extinction cross sections for 0.5- and 1-μm volume-equivalent radius tetrahedral NH3 ice crystals with and without nonabsorbing foreign cores to determine how particle shape and composition affect the strength and shape of resonant absorption features at 9.4 and 26 μm. The peak of the resonance is shifted relative to that for spherical particles, the maximum is smaller (except for 1-μ particles at 9.4 μm), and the integrated strength of the absorption falls in approximate proportion to the volume fraction of the core. It appears that small (r < 5 μm) NH3 particles cannot be the principal component of the Jovian haze in the 300- to 500-mbar region.

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DO - 10.1016/0019-1035(89)90170-X

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SP - 220

EP - 223

JO - Icarus

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ER -

Infrared absorption features for tetrahedral ammonia ice crystals

Abstract

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