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Lyman-α photodesorption from CO2(ice) at 75 K: Role of CO2 vibrational relaxation on desorption rate
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10.1063/1.4800943
/content/aip/journal/jcp/138/15/10.1063/1.4800943
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/15/10.1063/1.4800943

Figures

Image of FIG. 1.
FIG. 1.

Photodepletion of CO2 from various ices by Lyman-α radiation at 75 K. The Lyman-α fluence at the end of each experiment is 4.2 × 1018 photons cm−2.

Image of FIG. 2.
FIG. 2.

UV-induced photodesorption of 12CO2 and 13CO2 in different ice matrices at 75 K.

Image of FIG. 3.
FIG. 3.

UV-induced photodesorption of 12CO2 and 13CO2 in an unsymmetrical 12CO2 (75%) and 13CO2 (25%) mixed ice at 75 K. Each of the 13CO2 data points is averaged from 5 original spectra to reduce the noise.

Image of FIG. 4.
FIG. 4.

Kinetic pathways of confined CO2 in CO2(ice).

Image of FIG. 5.
FIG. 5.

Role of vibrational relaxation in lattice ice in depleting CO2(V*)—good coupling between pure CO2 molecules. When O···CO separation beyond a critical distance, rc, occurs, photoreaction takes place.

Image of FIG. 6.
FIG. 6.

Role of vibrational relaxation in lattice ice in depleting CO2(V*)—poor coupling between 12CO2 and 13CO2 molecules.

Tables

Generic image for table
Table I.

Comparison of the efficiency of CO2 photodesorption from different ice matrices at T = 75 K.

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/content/aip/journal/jcp/138/15/10.1063/1.4800943
2013-04-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lyman-α photodesorption from CO2(ice) at 75 K: Role of CO2 vibrational relaxation on desorption rate
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/15/10.1063/1.4800943
10.1063/1.4800943
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