Formation of protonated ammonia cluster ions: Two-color two-photon ionization study

Fuminori Misaizu; Paul L. Houston; Nobuyuki Nishi; Hisanori Shinohara; Tamotsu Kondow; Minoru Kinoshita

doi:10.1063/1.464626

Formation of protonated ammonia cluster ions: Two-color two-photon ionization study

Fuminori Misaizu, Paul L. Houston, Nobuyuki Nishi, Hisanori Shinohara, Tamotsu Kondow, Minoru Kinoshita

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Abstract

The mechanism of the resonance-enhanced two-photon ionization (RE2PI) and the dissociation of ammonia clusters has been investigated by using the two-color ionization technique and the reflectron time-of-flight mass spectrometer. The clusters are firstly excited to the intermediate state corresponding to the Ã ¹A₂ state of an ammonia molecule. The lifetime of the intermediate species is found to be < 10 ns for the production of NH₄⁺ and (NH3)₂⁺, and longer than 1 μs for (NH₃)_nNH₄ ⁺ (1≤n≤6). This result implies that NH₄⁺ is produced by the ionization of the dimer followed by the dissociation of NH₂, whereas the higher protonated cluster ions are produced by the second photon ionization of the (NH₃)_nNH₄ radicals produced by the dissociation of the parent clusters in the intermediate state. The appearance potentials of (NH₃)₂⁺ and (NH₃)_nNH₄⁺ (0≤n≤4) are also determined by two-color RE2PI technique. Those values are discussed in connection with the two possible mechanisms for the observed ion production, which confirms the scheme obtained from the lifetime measurement.

Original language	English
Pages (from-to)	336-341
Number of pages	6
Journal	The Journal of Chemical Physics
Volume	98
Issue number	1
DOIs	https://doi.org/10.1063/1.464626
Publication status	Published - 1993 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Formation of protonated ammonia cluster ions: Two-color two-photon ionization study",

abstract = "The mechanism of the resonance-enhanced two-photon ionization (RE2PI) and the dissociation of ammonia clusters has been investigated by using the two-color ionization technique and the reflectron time-of-flight mass spectrometer. The clusters are firstly excited to the intermediate state corresponding to the {\~A} 1A2 state of an ammonia molecule. The lifetime of the intermediate species is found to be < 10 ns for the production of NH4+ and (NH3)2+, and longer than 1 μs for (NH3)nNH4 + (1≤n≤6). This result implies that NH4+ is produced by the ionization of the dimer followed by the dissociation of NH2, whereas the higher protonated cluster ions are produced by the second photon ionization of the (NH3)nNH4 radicals produced by the dissociation of the parent clusters in the intermediate state. The appearance potentials of (NH3)2+ and (NH3)nNH4+ (0≤n≤4) are also determined by two-color RE2PI technique. Those values are discussed in connection with the two possible mechanisms for the observed ion production, which confirms the scheme obtained from the lifetime measurement.",

author = "Fuminori Misaizu and Houston, {Paul L.} and Nobuyuki Nishi and Hisanori Shinohara and Tamotsu Kondow and Minoru Kinoshita",

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T1 - Formation of protonated ammonia cluster ions

T2 - Two-color two-photon ionization study

AU - Misaizu, Fuminori

AU - Houston, Paul L.

AU - Nishi, Nobuyuki

AU - Shinohara, Hisanori

AU - Kondow, Tamotsu

AU - Kinoshita, Minoru

PY - 1993/1/1

Y1 - 1993/1/1

N2 - The mechanism of the resonance-enhanced two-photon ionization (RE2PI) and the dissociation of ammonia clusters has been investigated by using the two-color ionization technique and the reflectron time-of-flight mass spectrometer. The clusters are firstly excited to the intermediate state corresponding to the Ã 1A2 state of an ammonia molecule. The lifetime of the intermediate species is found to be < 10 ns for the production of NH4+ and (NH3)2+, and longer than 1 μs for (NH3)nNH4 + (1≤n≤6). This result implies that NH4+ is produced by the ionization of the dimer followed by the dissociation of NH2, whereas the higher protonated cluster ions are produced by the second photon ionization of the (NH3)nNH4 radicals produced by the dissociation of the parent clusters in the intermediate state. The appearance potentials of (NH3)2+ and (NH3)nNH4+ (0≤n≤4) are also determined by two-color RE2PI technique. Those values are discussed in connection with the two possible mechanisms for the observed ion production, which confirms the scheme obtained from the lifetime measurement.

AB - The mechanism of the resonance-enhanced two-photon ionization (RE2PI) and the dissociation of ammonia clusters has been investigated by using the two-color ionization technique and the reflectron time-of-flight mass spectrometer. The clusters are firstly excited to the intermediate state corresponding to the Ã 1A2 state of an ammonia molecule. The lifetime of the intermediate species is found to be < 10 ns for the production of NH4+ and (NH3)2+, and longer than 1 μs for (NH3)nNH4 + (1≤n≤6). This result implies that NH4+ is produced by the ionization of the dimer followed by the dissociation of NH2, whereas the higher protonated cluster ions are produced by the second photon ionization of the (NH3)nNH4 radicals produced by the dissociation of the parent clusters in the intermediate state. The appearance potentials of (NH3)2+ and (NH3)nNH4+ (0≤n≤4) are also determined by two-color RE2PI technique. Those values are discussed in connection with the two possible mechanisms for the observed ion production, which confirms the scheme obtained from the lifetime measurement.

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