Fundamental aspects of SNMS for thin film characterization: experimental studies and computer simulations

Husinsky, W.; Betz, G.

doi:10.1016/0040-6090(95)06954-2

Cited by 18 publications

(6 citation statements)

References 144 publications

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“…In turn, many atoms are simultaneously set in motion in the subsurface region, leading to high ejection yields of metal atoms and clusters. Such high action events have been observed by several authors − ,, and, in particular, they have been pointed out by Betz and co-workers to explain the emission of large clusters under kiloelectronvolt particle bombardment. − They are usually associated with significant damage in the sample. , …”

Section: Introductionmentioning

confidence: 82%

High Yield Events of Molecular Emission Induced by Kiloelectronvolt Particle Bombardment

Delcorte

Garrison

2000

J. Phys. Chem. B

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In an effort to improve our understanding of large molecule emission in organic SIMS, the sub-kiloelectronvolt and kiloelectronvolt Ar atom-induced sputtering of polystyrene tetramers adsorbed on Ag{111} is modeled using classical molecular dynamics. Above 1 keV, in addition to trajectories consisting of successive collisions between individual atoms, we observe a significant number of high action trajectories where several hundreds of substrate atoms are moving simultaneously. These events can generate unusually high emission yields of substrate atoms, clusters, and polystyrene molecules. Because the probability of high yield events strongly depends on the primary particle energy, representative sets of trajectories are calculated at 150 eV, 500 eV, 1500 eV, and 5 keV. These simulations indicate four main scenarios of action and sputtering. Plots of the energetic parts of the cascade ("collision trees") show that high sputtering yields occur when most of the primary particle energy is quickly dissipated among silver atoms belonging to the top silver layers. In addition, it is shown that high emission events influence not only the yield but also the kinetic energy distributions of ejected polystyrene molecules. Finally, we discuss the relevance of these high yield mechanisms for the ejection of organic species with a mass of several kilodaltons such as biomolecules and synthetic polymers. Our results show that trajectories falling in the "high yield" category are also capable of desorbing large intact molecules of ∼2000 Da.

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Section: Introductionmentioning

confidence: 82%

High Yield Events of Molecular Emission Induced by Kiloelectronvolt Particle Bombardment

Delcorte

Garrison

2000

J. Phys. Chem. B

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“…The experiments were carried out under UHV conditions with a base pressure of 10 −10 Torr. The UHV chamber was equipped with a reflectron type time‐of‐flight mass spectrometer,5–7 an ion gun and a high precision xyz target manipulator (shown in Figure 1). The whole vacuum system is baked out (for experiments with metal samples) for 24 h, so that the contaminants are released from the surfaces of the equipment.…”

Section: Experimental Partmentioning

confidence: 99%

“…For the secondary ion mass spectrometry (SIMS) experiments6 (noble gas or atomic metal projectile ions strike the surface at defined energies in the range 1–30 keV and eject secondary ions from the surface), the ion beam was incident on the target surface under an angle of 45° with respect to the target normal. The working gas was Xe.…”

Section: Experimental Partmentioning

confidence: 99%

Detection of Biological Molecules from Hard Biological Tissue Using Ion‐Beam‐Induced Desorption and Femtosecond Laser Ablation

Daskalova

Husinsky

2006

Plasma Processes & Polymers

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Summary: In the last 10–15 years laser ablation became very popular for the analysis of solid samples. The study of laser‐matter interaction processes on different time scales – nano, pico, femto, and their application in different fields developed a thorough knowledge of the fundamental laws involved in this process. The intention in the current research was to determine the general features of different ablation processes (ns, fs) and ion beam desorption process. The aim was to perform a complete set of measurements of different target materials by means of mass spectrometry studies. More specifically, the mass spectra of ablated and sputtered particles from organic matter were studied. Time of flight mass spectrometer was used for detection. An investigation of the mechanism of laser ablation of biological tissue is a complicated problem due to the complexity of the examined organic material. In our experiments the main aim was to obtain optimal signal detection without the onset of considerable fragmentation. Comparison will be made between the mass spectra from biological samples obtained with laser ablation, and those obtained under bombardment with 9 keV‐accelerated Xe+ ions. As a general tendency in nanosecond ablation and in SIMS experiments the detection of higher mass molecular species is negligible in correspondence to femtosecond laser ablation mass spectra. This can be due to the process of heating that develops under ion bombardment. This work demonstrates the sensitivity of the TOF technique and the potential of using this method for exploring the dynamics of the laser ablation and ion beam desorption processes.

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“…2 For this purpose, it is necessary to understand the physical details of the ablation process and in particular, the ion to neutral ratio and the energy distribution of the ablated particles. 3 In a typical surface analysis method, particles are removed by primary radiation from the solid surface. 3 In the particular case discussed here, ultra short laser radiation is used for particle removal .…”

Section: Introductionmentioning

confidence: 99%

“…3 In a typical surface analysis method, particles are removed by primary radiation from the solid surface. 3 In the particular case discussed here, ultra short laser radiation is used for particle removal .…”

Section: Introductionmentioning

confidence: 99%

Energy of neutral atoms ejected during ultrashort laser ablation of metals

Husinsky

Dachraoui

Matei

et al. 2004

High-Power Laser Ablation V

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We have investigated the energy and mass distribution of particles ejected from metals and semiconductors after irradiation with intense ultra-short laser radiation. Neutral atoms and clusters have been investigated. In many cases, clearly fast particles in the eV range and slow thermal particles can be identified. The influence of the laser pulse width on the energy distribution as well as the ion to neutral ratio have been investigated.

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Fundamental aspects of SNMS for thin film characterization: experimental studies and computer simulations

Cited by 18 publications

References 144 publications

High Yield Events of Molecular Emission Induced by Kiloelectronvolt Particle Bombardment

High Yield Events of Molecular Emission Induced by Kiloelectronvolt Particle Bombardment

Detection of Biological Molecules from Hard Biological Tissue Using Ion‐Beam‐Induced Desorption and Femtosecond Laser Ablation

Energy of neutral atoms ejected during ultrashort laser ablation of metals

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