Characterization of thin film CO2 ice through the infrared v1 + v3 combination mode

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm-1. To study how CO2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy to study the structural change of pure CO2 ice as a function of both ice thickness and temperature. We found that the v1 +v3 combination mode absorption profile at 3708 cm-1 provides an excellent probe to quantify the degree of crystallinity in CO2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO2 molecules, while the diffusion of CO2 becomes significant at much higher temperatures. In the formation of pure crystallineCO2 in interstellarmedium ices, the rate limiting process is the diffusion/segregation of CO2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO2 are formed.

Original languageEnglish (US)
Pages (from-to)860-866
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume473
Issue number1
DOIs
StatePublished - Jan 1 2018

Fingerprint

ice
thin films
Earth mantle
mantle
ice thickness
atomic absorption spectroscopy
crystallinity
phase transition
infrared spectroscopy
structural change
profiles
retraining
carbon dioxide
molecules
probe
absorption spectroscopy
dust
probes
water
temperature

Keywords

  • Infrared: ISM
  • ISM: evolution
  • ISM: molecules
  • Methods: laboratory

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Characterization of thin film CO2 ice through the infrared v1 + v3 combination mode. / He, Jiao; Vidali, Gianfranco.

In: Monthly Notices of the Royal Astronomical Society, Vol. 473, No. 1, 01.01.2018, p. 860-866.

Research output: Contribution to journalArticle

@article{4ca90924bd8c4cbc8b916a19df51606a,
title = "Characterization of thin film CO2 ice through the infrared v1 + v3 combination mode",
abstract = "Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm-1. To study how CO2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy to study the structural change of pure CO2 ice as a function of both ice thickness and temperature. We found that the v1 +v3 combination mode absorption profile at 3708 cm-1 provides an excellent probe to quantify the degree of crystallinity in CO2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO2 molecules, while the diffusion of CO2 becomes significant at much higher temperatures. In the formation of pure crystallineCO2 in interstellarmedium ices, the rate limiting process is the diffusion/segregation of CO2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO2 are formed.",
keywords = "Infrared: ISM, ISM: evolution, ISM: molecules, Methods: laboratory",
author = "Jiao He and Gianfranco Vidali",
year = "2018",
month = "1",
day = "1",
doi = "10.1093/MNRAS/STX2412",
language = "English (US)",
volume = "473",
pages = "860--866",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

TY - JOUR

T1 - Characterization of thin film CO2 ice through the infrared v1 + v3 combination mode

AU - He, Jiao

AU - Vidali, Gianfranco

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm-1. To study how CO2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy to study the structural change of pure CO2 ice as a function of both ice thickness and temperature. We found that the v1 +v3 combination mode absorption profile at 3708 cm-1 provides an excellent probe to quantify the degree of crystallinity in CO2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO2 molecules, while the diffusion of CO2 becomes significant at much higher temperatures. In the formation of pure crystallineCO2 in interstellarmedium ices, the rate limiting process is the diffusion/segregation of CO2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO2 are formed.

AB - Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm-1. To study how CO2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy to study the structural change of pure CO2 ice as a function of both ice thickness and temperature. We found that the v1 +v3 combination mode absorption profile at 3708 cm-1 provides an excellent probe to quantify the degree of crystallinity in CO2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO2 molecules, while the diffusion of CO2 becomes significant at much higher temperatures. In the formation of pure crystallineCO2 in interstellarmedium ices, the rate limiting process is the diffusion/segregation of CO2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO2 are formed.

KW - Infrared: ISM

KW - ISM: evolution

KW - ISM: molecules

KW - Methods: laboratory

UR - http://www.scopus.com/inward/record.url?scp=85046109593&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046109593&partnerID=8YFLogxK

U2 - 10.1093/MNRAS/STX2412

DO - 10.1093/MNRAS/STX2412

M3 - Article

VL - 473

SP - 860

EP - 866

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -