Positive and negative cluster ions and multiply charged ions produced from frozen nitrogen, carbon monoxide and oxygen molecules under energetic, heavy-ion impact

Tonuma, T.; Kumagai, H.; Matsuo, Takashi; Shibata, Hiromi; Tawara, H.

doi:10.1016/0168-1176(94)04002-8

Cited by 15 publications

(21 citation statements)

References 18 publications

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“…For 252 Cf FF [7] and 1.5 MeV/u Ar 13+ [11] projectiles, the desorption yield of the N þ 2 ions is the highest, differently from the results obtained with electron or keV ion-impact desorption experiments, where the N + yield is the highest [8].…”

Section: Ionization Potential and The Mass Spectra Abundancescontrasting

confidence: 69%

“…When the target is a frozen gas with low molecular weight such as nitrogen, one might expect that the desorbed species would be mostly atoms or small molecules with small number of constituents because these gases condensate only through weak van der Waals interactions. However, the emission of a large number of cluster ions N þ n has been observed in experiments with 252 Cf FF (n up to $22) [7], with keV He + ion bombardment (n up to $30) [8] and with 1.5 MeV/u Ar 13+ ion impact (n up to $20) [11]. Since many of the clusters' characteristics (e.g.…”

Section: Introductionmentioning

confidence: 97%

“…Processes in which very fast and highly charged projectiles induce electronic sputtering on low-temperature condensed-gas solids (ices) are relevant since they occur in cometary's surfaces and outer-solar-system bodies [7][8][9][10][11][12]. When the target is a frozen gas with low molecular weight such as nitrogen, one might expect that the desorbed species would be mostly atoms or small molecules with small number of constituents because these gases condensate only through weak van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

et al. 2007

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Section: Ionization Potential and The Mass Spectra Abundancescontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

et al. 2007

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“…The Coulomb interaction of the multi-charged ϳ0.6 MeV/u fission fragment with CO molecules in the close vicinity of the track is a very energetic process ionizing and dissociating most of the molecules within a radius of 0.5 nm. Abundant (CO) n ϩ production was also observed by 1.5 MeV/u Ar 13ϩ projectiles impact [28]. In particular, the electronic stopping power process induces emission of multi-charged C and O ions, which are indeed observed [6].…”

Section: Discussion Of Ion Formationmentioning

confidence: 92%

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Ponciano

Martínez

Farenzena

et al. 2006

J. Am. Soc. Mass Spectrom.

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Condensed CO and CO2 are bombarded by approximately 65 MeV 252Cf fission fragments and the desorbed ions are analyzed by time-of-flight mass spectrometry as a function of target temperature, in the ranges 25-33 K and 75-91 K, respectively. Absolute desorption yields are measured up to complete ice sublimation. The mass spectra of both ice targets reveal the emission of: (1) low mass ions, produced by direct Coulomb interaction of the highly charged projectiles and delta-electrons with CO and CO2, and (2) pronounced series of cluster ions. The basic ice cluster structures (CO)n and (CO2)n are present in the emitted cluster series such as (CO)nCO+, (CO2)nCO2+, or (CO2)nCO3-. In the case of CO ice, however, the intense production of the series Cn+, Cn-, and (CO)mCn+ shows that Cn is the main cluster structure, consequence of a higher concentration of free carbon atoms in the nuclear track plasma of CO ice than in that of CO2 ice. Ion cluster abundance is observed to decrease exponentially with cluster mass. The decay constant is k(n) congruent with 0.13, about the same for series based on (CO)n and (CO2)n, but a factor 3.3 higher for the Cn series. The Cn clusters are formed by gas-phase condensation, but the (CO)n and (CO2)n clusters are produced by fracturing of the highly excited solid around the nuclear track. A dramatic reduction of the ion desorption yield is observed near T = 29 K for CO and near T = 85 K for CO2, when fast sublimation occurs and ice thickness vanishes. Close to sublimation temperature, the decay constant of the (CO)2Cn+ series increases due to a decreasing formation probability of large Cn clusters.

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“…16,22,[59][60][61] More recently, some frozen gases were analyzed using highly charged megaelectronvolt heavy-ion bombardment. [62][63][64][65][66] A characteristic feature of the LT secondary emission mass spectra is the presence of relatively large cluster ions over the whole temperature range of the existence of solid inorganic sample. The occurrence of beam-induced reactions leading to the production of clusters of unexpected composition has been reported.…”

Section: Applications Of Lt-fab/sims In Chemistry and Physicsmentioning

confidence: 99%

Low temperature secondary emission mass spectrometry. Cryobiological applications

Kosevich

1998

Eur. J. Mass Spectrom.

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Recent achievements of low temperature secondary emission mass spectrometry in exotic fields of life sciences such as cryobiology are surveyed. Specific problems of molecular cryobiology and cryobiophysics accessible to mass spectrometric investigation are defined and the potential of low temperature fast-atom bombardment and secondary ion mass spectrometry in studies of frozen water and cryoprotector solutions of biologically active compounds are demonstrated. Emphasis is placed on the elucidation of changes in intermolecular interactions, the binding of metal ions, water and cryoprotectors with biomolecules at reduced temperatures in comparison with ambient conditions. A model for interpretation of the low temperature secondary emission mass spectra, based on details of phase diagrams of the system under study, the heterogeneous structure of the sample resulting from phase separation during freezing and phase transitions in the sample with temperature variation is discussed.

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Positive and negative cluster ions and multiply charged ions produced from frozen nitrogen, carbon monoxide and oxygen molecules under energetic, heavy-ion impact

Cited by 15 publications

References 18 publications

Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

Electronic sputtering produced by fission fragments on condensed CO and CO₂

Low temperature secondary emission mass spectrometry. Cryobiological applications

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Positive and negative cluster ions and multiply charged ions produced from frozen nitrogen, carbon monoxide and oxygen molecules under energetic, heavy-ion impact

Cited by 15 publications

References 18 publications

Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

Characterization of clusters produced by 252Cf fission fragment impact on a N2 ice target

Electronic sputtering produced by fission fragments on condensed CO and CO2

Low temperature secondary emission mass spectrometry. Cryobiological applications

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Product

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Electronic sputtering produced by fission fragments on condensed CO and CO₂