Ion beam induced desorption with postionization using high repetition femtosecond lasers

Brummel, Christopher L.; Willey, K. F.; Vickerman, John C.; Winograd, Nicholas

doi:10.1016/0168-1176(94)04121-m

Cited by 49 publications

(43 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…11,12 Femtosecond postionization studies showing a significant reduction in the degree of fragmentation when compared to nanosecond excitation have been reported. [13][14][15] For example, Benninghoven and co-workers report ionization efficiencies for producing intact molecular ions from sinapinic acid and tryptophan are comparable to those found for atomic photoionization. 14 In this paper we discuss the pertinent experimental factors associated with postionization of desorbed neutral molecules and how they relate to chemical imaging of surfaces.…”

mentioning

confidence: 69%

“…These ideas have been confirmed in earlier work reported on the conjugated system benzo[a]pyrene. 15 In postionization experiments utilizing UV excitation, minimal fragmentation is observed. For PBA, Fig.…”

Section: Resultsmentioning

confidence: 98%

“…The procedure utilized to estimate the beam area at the interaction region has been reported previously. 15 The mass resolution of a reflectron-based TOF instrument in SIMS experiments, is largely determined by the duration of the gun pulse. This places an upper limit on the gun pulse duration that may be used and still obtain the mass resolving power to distinguish between pure organics and metal containing species.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Postionization of molecules desorbed from surfaces by keV ion bombardment with femtosecond laser pulses

Willey

Vorsa

Braun

et al. 1998

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

We report the use of femtosecond laser photoionization of sputtered neutral molecules to enhance the sensitivity of detection and to improve the prospects for molecule-specific imaging experiments. Results are presented for patterned metal oxides, polycyclic aromatic hydrocarbons and several amino acids. In addition to increased signal levels, we find that is photoionization generally yields simpler mass spectra than the corresponding SIMS spectra, although considerable fragmentation is observed in both cases.

show abstract

mentioning

confidence: 69%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Postionization of molecules desorbed from surfaces by keV ion bombardment with femtosecond laser pulses

Willey

Vorsa

Braun

et al. 1998

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

show abstract

“…Naphthalene thiol molecules were desorbed from the 150 K substrate and postionized using 800 nm, 100 fs light from a Ti:sapphire laser system. 18,19 This 200 mm Â 200 mm image clearly shows the chemical isolation of gold within the stripe and surrounding [MÀS] signal from naphthalene thiol. Some Au intensity is observed throughout the image since the naphthalene thiol monolayer is semitransparent to the ion beam.…”

Section: Resultsmentioning

confidence: 97%

Performance characteristics of a chemical imaging time-of-flight mass spectrometer

Braun

Blenkinsopp

Mullock³

et al. 1998

Rapid Commun. Mass Spectrom.

174

150

View full text Add to dashboard Cite

A chemical imaging time-of-flight secondary ion mass spectrometer is described. It consists of a liquid metal ion gun, medium energy resolution reflectron mass analyzer, liquid nitrogen cooled sample stage, preparation chamber and dual stage entry port. Unique features include compatibility with laser postionization experiments, large field of view, cryogenic sample handling capability and high incident ion beam current. Instrument performance is illustrated by the characterization of scanning electron microscopy grids, silver and functionalized polystyrene beads and the postionization of an organic overlayer on a gold substrate.

show abstract

“…While in the case of SIMS the secondary ions originate from the emission dynamics at the surface, SNMS uses an external source to postionize the sputtered neutral species. Most of the previously published results on laser postionization in the SNMS regime [5][6][7][8][9][10][11][12][13][14] were performed using either nanosecond (ns) UV lasers or femtosecond (fs) laser systems providing 800 nm or shorter wavelengths. However, the fs postionization regime requires intensities of the order of 10 12 -10 14 W/cm 2 (i.e., to enter the multiphoton ionization (MPI) domain, which in turn means that mJ class fs laser systems are required.…”

mentioning

confidence: 99%

Infrared Femtosecond Laser Preionization in Secondary Ion Mass Spectrometry of Silver Surface

Lorenc

Jáné

Stupavská

et al. 2012

J. Am. Soc. Mass Spectrom.

View full text Add to dashboard Cite

An alternative secondary ion mass spectrometry utilizing laser preionization is introduced. The native Ag sample surface is first irradiated with laser pulse (100 fs duration, 10 10 -10 11 W/cm 2 intensity, 1240 nm wavelength) and subsequently bombarded with primary ions (Bi 3 + , 10 ns duration, 25 keV energy). Multiple correlation patterns are observed in the mass spectra, confirming the mutual laser-secondary ion mass spectrometry (SIMS) interplay in the preionization mechanism. The Ag respectively. Two ionization mechanisms are identified, the ion sputtering regime for intensities of less than 1.4×10 11 W/cm 2 and the multiphoton ionization at higher intensities. The Ag saturation intensity obtained from fitting is 2.4×10 13 W/cm 2 , close to the one reported for postionization. The proposed preionization approach might eliminate the need for high peak power/high intensity laser source and, moreover, the experiment geometry ensures that large areas of the sample are affected by the laser beam.

show abstract

Ion beam induced desorption with postionization using high repetition femtosecond lasers

Cited by 49 publications

References 41 publications

Postionization of molecules desorbed from surfaces by keV ion bombardment with femtosecond laser pulses

Postionization of molecules desorbed from surfaces by keV ion bombardment with femtosecond laser pulses

Performance characteristics of a chemical imaging time-of-flight mass spectrometer

Infrared Femtosecond Laser Preionization in Secondary Ion Mass Spectrometry of Silver Surface

Contact Info

Product

Resources

About