Photodissociation of spatially aligned acetaldehyde cations

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

doi:10.1021/jp067706l

Photodissociation of spatially aligned acetaldehyde cations

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

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

9 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 language	English
Pages (from-to)	6741-6745
Number of pages	5
Journal	Journal of Physical Chemistry A
Volume	111
Issue number	29
DOIs	https://doi.org/10.1021/jp067706l
State	Published - 26 Jul 2007

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title = "Photodissociation of spatially aligned acetaldehyde cations",

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.",

author = "Lee, \{Suk Kyoung\} and Ruchira Silva and Kim, \{Myung Hwa\} and Lei Shen and Suits, \{Arthur G.\}",

year = "2007",

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doi = "10.1021/jp067706l",

language = "English",

volume = "111",

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journal = "Journal of Physical Chemistry A",

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TY - JOUR

T1 - Photodissociation of spatially aligned acetaldehyde cations

AU - Lee, Suk Kyoung

AU - Silva, Ruchira

AU - Kim, Myung Hwa

AU - Shen, Lei

AU - Suits, Arthur G.

PY - 2007/7/26

Y1 - 2007/7/26

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/34547697286

U2 - 10.1021/jp067706l

DO - 10.1021/jp067706l

M3 - Article

C2 - 17388576

AN - SCOPUS:34547697286

SN - 1089-5639

VL - 111

SP - 6741

EP - 6745

JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

IS - 29

ER -

Photodissociation of spatially aligned acetaldehyde cations

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