A beam scattering instrument for the dynamics studies of surface-induced dissociation processes

Shukla, Anil

doi:10.1063/1.1524713

Cited by 13 publications

(7 citation statements)

References 29 publications

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“…The electrically floated, EQ post-collision analyzer and detection system is mounted on a rail capable of revolution and acquisition of angle/energy resolved SID spectra. 18 Sectors have also been coupled with other analyzers such as quadrupoles, 18,19 time-of-flight (TOF), 16,20,21 and other sector 22 analyzers. Later instruments used other geometries [23][24][25][26][27][28][29][30] and/or included other analyzers such as tandem-in-time instruments like the FT-ICR MS. 31 Quadrupole mass filters have the advantage that they use low energy ion beams and this makes them particularly attractive for soft-landing experiments in which low energy ion beams are required.…”

Section: Instrumentationmentioning

confidence: 99%

Ion/surface reactions and ion soft-landing

Gologan

Green

Alvarez

et al. 2005

Phys. Chem. Chem. Phys.

130

123

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Ion/surface collision phenomena in the hyperthermal collision energy regime (1-100 eV) are reviewed, with emphasis on chemical processes associated with the impact of small organic and biological ions at functionalized self-assembled monolayer surfaces. Inelastic collisions can lead to excitation of the projectile ion and can result in fragmentation, a process known as surface-induced dissociation which is useful in chemical analysis using tandem mass spectrometry. Changes in charge can accompany ion/surface collisions and those associated with a change in polarity (positive to negative ions or vice versa) are an attractive method for ion structural characterization and isomer differentiation. The surface-induced charge inversion of nitrobenzene and other substituted aromatics is discussed. Reactive collisions occurring between gaseous ions and surfaces depend on the chemical nature of the collision partners. These reactions can be used for selected chemical modifications of surfaces as well as for surface analysis. Particular emphasis is given here to ion soft-landing, another type of ion/surface interaction, in which the projectile ion is landed intact at the surface, either as the corresponding neutral molecule or, interestingly but less commonly, in the form of the ion itself. The ion soft-landing experiment allows for preparative mass spectrometry; for example the preparation of pure biological compounds by using the mass spectrometer as a separation device. After separation, the mass-selected ions are collected by soft-landing, at different spatial points in an array. If the experiment is performed using a suitable liquid medium, in the case of some proteins at least, biological activity is retained.

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Section: Instrumentationmentioning

confidence: 99%

Ion/surface reactions and ion soft-landing

Gologan

Green

Alvarez

et al. 2005

Phys. Chem. Chem. Phys.

130

123

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“…The beam scattering instrument at PNNL (PNNL II) uses a double-focusing sector field mass spectrometer , as in the Purdue I instrument (BEEQ) . These types of mass analyzers produce stable ion beams that are precisely defined in mass and energy.…”

Section: Instrumentation For Ion/surface Collision Experimentsmentioning

confidence: 99%

“…The beam scattering instrument at PNNL (PNNL II) uses a double-focusing sector f ield mass spectrometer, as in the Purdue I instrument (BEEQ). 181 These types of mass analyzers produce stable ion beams that are precisely defined in mass and energy. PNNL II has an energy resolution of 2000−5000 at 1.25 keV compared to 1000 (10% valley) for a 3 keV ion beam for the BEEQ instrument at Purdue.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Low-Energy Ionic Collisions at Molecular Solids

et al. 2012

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Figure 2. Ion/surface collision spectrum recorded after collision of 30 eV benzene molecular ions at an H-SAM surface. The ion at m/z 91 corresponds to the addition of a methyl group followed by loss of H 2 and that at m/z 65 to further loss of C 2 H 2 . The peak at m/z 79 is due to a H atom abstraction reaction. The inset shows the collision process and some reaction products. Reprinted from ref 72.

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“…Low energy ion scattering (LEIS), where mass selected ions in the 10-100 eV energy range collide on a well-defined surface and the product ions are mass analyzed, is an extremely surface sensitive, 1 molecule specific, 2 and structure specific 3 tool attracting significant attention these days. [4][5][6] Chemical reactivity of polyatomic ions at low energies and the capability to confine them in a spatially specific fashion with energy [7][8][9][10] and angle resolution 11,12 have made it possible to explore novel phenomena using this technique. Precise control of ions has made it possible to soft-land ions at surfaces, 5 which has implications to chemistry, biology, and devices.…”

Section: Introductionmentioning

confidence: 99%

Development of ultralow energy (1–10 eV) ion scattering spectrometry coupled with reflection absorption infrared spectroscopy and temperature programmed desorption for the investigation of molecular solids

Bag

Bhuin

Methikkalam

et al. 2014

Review of Scientific Instruments

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Extremely surface specific information, limited to the first atomic layer of molecular surfaces, is essential to understand the chemistry and physics in upper atmospheric and interstellar environments. Ultra low energy ion scattering in the 1-10 eV window with mass selected ions can reveal extremely surface specific information which when coupled with reflection absorption infrared (RAIR) and temperature programmed desorption (TPD) spectroscopies, diverse chemical and physical properties of molecular species at surfaces could be derived. These experiments have to be performed at cryogenic temperatures and at ultra high vacuum conditions without the possibility of collisions of neutrals and background deposition in view of the poor ion intensities and consequent need for longer exposure times. Here we combine a highly optimized low energy ion optical system designed for such studies coupled with RAIR and TPD and its initial characterization. Despite the ultralow collision energies and long ion path lengths employed, the ion intensities at 1 eV have been significant to collect a scattered ion spectrum of 1000 counts/s for mass selected CH2(+).

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A beam scattering instrument for the dynamics studies of surface-induced dissociation processes

Cited by 13 publications

References 29 publications

Ion/surface reactions and ion soft-landing

Ion/surface reactions and ion soft-landing

Low-Energy Ionic Collisions at Molecular Solids

Development of ultralow energy (1–10 eV) ion scattering spectrometry coupled with reflection absorption infrared spectroscopy and temperature programmed desorption for the investigation of molecular solids

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