Electronic structure and stability of NH4(NH3)n and NH4(NH3)m(H2O)n

R. Takasu; K. Fuke; F. Misaizu

doi:10.1142/S0218625X96000644

Electronic structure and stability of NH₄(NH₃)_n and NH₄(NH₃)_m(H₂O)_n

R. Takasu, K. Fuke, F. Misaizu

SCI - Chemistry

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

11 Citations (Scopus)

Abstract

The photoionization process of NH₄(NH₃)_n and NH₄(NH₃)_m(H₂O)_n radicals produced by an ArF excimer laser photolysis of ammonia clusters and ammonia-water mixed clusters are examined using time-of-flight mass spectroscopy. The ionization potentials (IPs) of NH₄(NH₃)_n (n=0-35) and NH₄(NH₃)_m(H₂O)_n (m-0-4, n=0-3) are determined by the photoionization threshold measurements. The binding energies of NH₄(NH₃)_n-1-NH₃ (n=1-6) are estimated from IPs. The results indicate that the bonding between NH₄ and NH₃ is semi-ionic. The IPs for the large ammoniated NH₄ clusters decrease with increasing n up to 35. The limiting value (n → ∞) is found to be 1.33 eV, which coincides with the photoemission threshold of liquid NH₃. This feature is similar to those found recently for alkali-atom-ammonia clusters. A clear trend is found for the IPs of NH₄(NH₃)_m(H₂O)_n; the clusters containing more water molecules have higher IP. This trend is ascribed to the large binding energy of NH⁺₄-NH₃ comparing with that of NH⁺₄-H₂O.

Original language	English
Pages (from-to)	353-357
Number of pages	5
Journal	Surface Review and Letters
Volume	3
Issue number	1
DOIs	https://doi.org/10.1142/S0218625X96000644
Publication status	Published - 1996 Feb

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title = "Electronic structure and stability of NH4(NH3)n and NH4(NH3)m(H2O)n",

abstract = "The photoionization process of NH4(NH3)n and NH4(NH3)m(H2O)n radicals produced by an ArF excimer laser photolysis of ammonia clusters and ammonia-water mixed clusters are examined using time-of-flight mass spectroscopy. The ionization potentials (IPs) of NH4(NH3)n (n=0-35) and NH4(NH3)m(H2O)n (m-0-4, n=0-3) are determined by the photoionization threshold measurements. The binding energies of NH4(NH3)n-1-NH3 (n=1-6) are estimated from IPs. The results indicate that the bonding between NH4 and NH3 is semi-ionic. The IPs for the large ammoniated NH4 clusters decrease with increasing n up to 35. The limiting value (n → ∞) is found to be 1.33 eV, which coincides with the photoemission threshold of liquid NH3. This feature is similar to those found recently for alkali-atom-ammonia clusters. A clear trend is found for the IPs of NH4(NH3)m(H2O)n; the clusters containing more water molecules have higher IP. This trend is ascribed to the large binding energy of NH+4-NH3 comparing with that of NH+4-H2O.",

author = "R. Takasu and K. Fuke and F. Misaizu",

year = "1996",

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doi = "10.1142/S0218625X96000644",

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AU - Takasu, R.

AU - Fuke, K.

AU - Misaizu, F.

PY - 1996/2

Y1 - 1996/2

N2 - The photoionization process of NH4(NH3)n and NH4(NH3)m(H2O)n radicals produced by an ArF excimer laser photolysis of ammonia clusters and ammonia-water mixed clusters are examined using time-of-flight mass spectroscopy. The ionization potentials (IPs) of NH4(NH3)n (n=0-35) and NH4(NH3)m(H2O)n (m-0-4, n=0-3) are determined by the photoionization threshold measurements. The binding energies of NH4(NH3)n-1-NH3 (n=1-6) are estimated from IPs. The results indicate that the bonding between NH4 and NH3 is semi-ionic. The IPs for the large ammoniated NH4 clusters decrease with increasing n up to 35. The limiting value (n → ∞) is found to be 1.33 eV, which coincides with the photoemission threshold of liquid NH3. This feature is similar to those found recently for alkali-atom-ammonia clusters. A clear trend is found for the IPs of NH4(NH3)m(H2O)n; the clusters containing more water molecules have higher IP. This trend is ascribed to the large binding energy of NH+4-NH3 comparing with that of NH+4-H2O.

AB - The photoionization process of NH4(NH3)n and NH4(NH3)m(H2O)n radicals produced by an ArF excimer laser photolysis of ammonia clusters and ammonia-water mixed clusters are examined using time-of-flight mass spectroscopy. The ionization potentials (IPs) of NH4(NH3)n (n=0-35) and NH4(NH3)m(H2O)n (m-0-4, n=0-3) are determined by the photoionization threshold measurements. The binding energies of NH4(NH3)n-1-NH3 (n=1-6) are estimated from IPs. The results indicate that the bonding between NH4 and NH3 is semi-ionic. The IPs for the large ammoniated NH4 clusters decrease with increasing n up to 35. The limiting value (n → ∞) is found to be 1.33 eV, which coincides with the photoemission threshold of liquid NH3. This feature is similar to those found recently for alkali-atom-ammonia clusters. A clear trend is found for the IPs of NH4(NH3)m(H2O)n; the clusters containing more water molecules have higher IP. This trend is ascribed to the large binding energy of NH+4-NH3 comparing with that of NH+4-H2O.

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Electronic structure and stability of NH₄(NH₃)_n and NH₄(NH₃)_m(H₂O)_n

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