Comparative Polymerization in the Gas Phase and in Clusters. 2. Electron Impact and Multiphoton-Induced Reactions in Isobutene and Benzene/Isobutene Clusters

El‐Shall, M. Samy; Daly, George M.; Yu, Zhen; Meot‐Ner, Michael

doi:10.1021/ja00134a019

Cited by 31 publications

(58 citation statements)

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“…30,31,54,55 The essential elements of the apparatus are jet and beam chambers coupled to a time-of-flight mass spectrometer. The binary clusters are formed in a He-seeded jet expansion, and probed as a skimmed cluster beam in a collision-free high vacuum chamber with a delay between synthesis and probe ͑i.e., the neutral beam flight time͒ on the order of one millisecond.…”

Section: Methodsmentioning

confidence: 99%

Experimental and theoretical study of benzene (acetonitrile)n clusters, n=1–4

El‐Shall¹,

Daly²,

Wright³

2002

The Journal of Chemical Physics

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Section: Methodsmentioning

confidence: 99%

Experimental and theoretical study of benzene (acetonitrile)n clusters, n=1–4

El‐Shall¹,

Daly²,

Wright³

2002

The Journal of Chemical Physics

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“…Similar results obtained by various other experimental methods applied to the study of a number of different systems led the investigators to suggest that gas phase cationic polymerization is responsible for the occurrence of the high molecular weight ions. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Meanwhile, considerable effort has been devoted to the investigation of these ion-molecule reactions in the cluster regime [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] as well. This has been prompted by the recognition that interrogating clusters provides a way of studying the energetics and dynamics of intermediate states of matter as cluster systems evolve from the gas toward the condensed state.…”

Section: Introductionmentioning

confidence: 99%

Intracluster Polymerization Reactions of Alkene Cluster Ions

et al. 1997

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The unimolecular dissociation dynamics of selected alkene cluster ions (ethene, propene, 1-butene, trans-2butene, and cis-2-butene) and their fast fragment ions has been investigated using a reflectron time-of-flight mass spectrometer. These ions were prepared by the supersonic expansion of a premixed sample gas containing 20% alkene in Ar, followed by multiphotoionization (MPI) using a Ti:sapphire femtosecond laser. From the unimolecular decomposition patterns of all the ions investigated, we conclude that after photoionization a radical cation initiated intracluster polymerization takes place in these cluster ions. But, due to steric hindrance, it does not continue indefinitely as the cluster size increases. For ethene, pentamerization can be observed, and for propene, trimerization; while in the case of the three isomeric butenes, 1-butene is partially trimerized and only dimerization is observed in 2-butene.

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“…Less relevant to the current objectives are a limited number of accounts of twophoton induced polymerization in the gas phase. [21][22][23][24] Two-photon photopolymerization of commercial acrylate monomer systems, preformulated with UV photoinitiators, has been reported, although little information regarding photoinitiators was available. [25][26][27][28] Two-photon absorbing compounds based on phenylethenyl constructs bearing electron-donating and/or electron-withdrawing moieties have been reported.…”

Section: Two-photon Microfabricationmentioning

confidence: 99%