Surface analysis by laser ionization

He, Chun; Becker, Christopher H.

doi:10.1016/s1359-0286(96)80063-5

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…What may not be immediately obvious is that a significant ionization efficiency penalty is paid by transitioning from SPI to MPI. If MPI plays a significant role in the laser postionization mechanism, power densities exceeding 10 10 W/cm 2 are required for effective photoionization of sputtered neutrals (these densities can only be reached by pulsed lasers) [15].…”

Section: Pnnl-23935mentioning

confidence: 99%

Laser Photoionization of Sputtered Neutral atoms in PNNL SIMS and Applications in Nuclear Materials and Environmental Analyses (FY14 Progress Report for PL12-LaserSPec SIMS-PD08)

Willingham

Naes

Fahey

et al. 2014

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Section: Pnnl-23935mentioning

confidence: 99%

Laser Photoionization of Sputtered Neutral atoms in PNNL SIMS and Applications in Nuclear Materials and Environmental Analyses (FY14 Progress Report for PL12-LaserSPec SIMS-PD08)

Willingham

Naes

Fahey

et al. 2014

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“…For quantitative surface and material analysis, Becker and He et al [19][20][21][22] have studied some gases (Ar, Kr, NO, Xe, N 2 , and O 2 ) and solid samples (SiO 2 , GaAs, SiC and C1154 alloy) using a high intensity (10 14 -10 15 Wcm À2 ) 35 ps laser at 532 nm with time-of-flight mass spectrometry. The results, with the relative sensitivity factors (RSFs) close to unity, showed that the saturation of the multiphoton ionisation and uniform ionisation yields were achieved even for species with different ionisation potentials.…”

mentioning

confidence: 99%

Uniform molecular analysis using femtosecond laser mass spectrometry

Fang

Ledingham

Graham

et al. 1999

Rapid Commun. Mass Spectrom.

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The potential of femtosecond laser time-of-flight mass spectrometry (FLMS) for uniform quantitative analysis of molecules has been investigated. Various samples of molecular gases and vapours have been studied, using ultra-fast ($50 fs) laser pulses with very high intensity (up to 1.6 Â 10 16 Wcm À2 ) for nonresonant multiphoton ionisation/tunnel ionisation. Some of these molecules have high ionisation potentials, requiring up to ten photons for non-resonant ionisation. The relative sensitivity factors (RSF) have been determined as a function of the laser intensity and it has been demonstrated that for molecules with very different masses and ionisation potentials, uniform ionisation has been achieved at the highest laser intensities. Quantitative laser mass spectrometry of molecules is therefore a distinct possibility.

show abstract

Uniform molecular analysis using femtosecond laser mass spectrometry

Fang

Ledingham

Graham

et al. 1999

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

The potential of femtosecond laser time-of-flight mass spectrometry (FLMS) for uniform quantitative analysis of molecules has been investigated. Various samples of molecular gases and vapours have been studied, using ultra-fast ( approximately 50 fs) laser pulses with very high intensity (up to 1.6 x 10(16) Wcm(-2)) for non-resonant multiphoton ionisation/tunnel ionisation. Some of these molecules have high ionisation potentials, requiring up to ten photons for non-resonant ionisation. The relative sensitivity factors (RSF) have been determined as a function of the laser intensity and it has been demonstrated that for molecules with very different masses and ionisation potentials, uniform ionisation has been achieved at the highest laser intensities. Quantitative laser mass spectrometry of molecules is therefore a distinct possibility. Copyright 1999 John Wiley & Sons, Ltd.

show abstract

Surface analysis by laser ionization

Cited by 5 publications

References 19 publications

Laser Photoionization of Sputtered Neutral atoms in PNNL SIMS and Applications in Nuclear Materials and Environmental Analyses (FY14 Progress Report for PL12-LaserSPec SIMS-PD08)

Laser Photoionization of Sputtered Neutral atoms in PNNL SIMS and Applications in Nuclear Materials and Environmental Analyses (FY14 Progress Report for PL12-LaserSPec SIMS-PD08)

Uniform molecular analysis using femtosecond laser mass spectrometry

Uniform molecular analysis using femtosecond laser mass spectrometry

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