PHOTODISSOCIATION DYNAMICS OF CORONENE AT 532 NM

Ober, Douglas

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https://hdl.handle.net/2142/122720 Copy

Description

Title

PHOTODISSOCIATION DYNAMICS OF CORONENE AT 532 NM

Author(s)

Ober, Douglas

Contributor(s)

• Okumura, Mitchio
• Nemchick, Deacon J
• Beauchamp, Jesse Lee
• Hodyss, Robert
• Maiwald, Frank
• Nguyen, Tyler M

Issue Date

2023-06-23

Keyword(s)

Photodissociation and photochemistry

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are an important reservoir of carbon in the interstellar medium, and central to proposed formation mechanisms for identified fullerenes. The process of PAH photofragmentation is not fully understood, and depends on molecular identity and light source characteristics. In this work, protonated coronene and per-deuterated coronene were photofragmented in a modified commercial linear ion-trap mass spectrometer via focused continuous-wave 532 nm laser light. The laser power and ion trapping time were scanned to discover trends in the photodissociation process. A sequential photodissociation process was discovered: first the creation of the coronene cation, then hydrogen loss through molecular hydrogen removal, and finally carbon cluster fragmentation producing a series of shrinking carbon cations. The fragment distribution could qualitatively change under constant total photodissociation energy, being second-order with respect to laser power but first-order with respect to irradiation time. Lastly, several unexpected spectroscopic states and potential isomerization were discovered in the photodissociation process.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122720

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