Photodissociation of spatially aligned acetaldehyde cations

Suk Kyoung Lee, Ruchira Silva, Myung Hwa Kim, Lei Shen, Arthur G. Suits

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Photofragment translational energy and angular distributions are reported for the photodissociation of acetaldehyde cations in the wavelength range 354-363 nm obtained using the DC slice ion imaging technique. Vibrationally selected parent ions were produced by 2+1 resonance-enhanced multiphoton ionization (REMPI) via the 3s ← n Rydberg transition, with photodissociation resulting from absorption of a fourth additional photon. Three product channels were observed: HCO +, CH 3CO +, and CH 4 +. The angular distributions reveal that all product channels have a predominantly parallel recoil anisotropy although the lower β 2 parameter of CH 3CO + indicates the concomitant presence of a perpendicular component. Furthermore, the distinct angular distribution of the CH 3CO + fragments shows a large value of the higher order Legendre polynomial term, providing evidence that acetaldehyde cations are spatially aligned during the ionization process.

Original languageEnglish (US)
Pages (from-to)6741-6745
Number of pages5
JournalJournal of Physical Chemistry A
Volume111
Issue number29
DOIs
StatePublished - Jul 26 2007

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