Matrix-assisted laser desorption and ionization in the OH and CO absorption bands of aliphatic and aromatic matrices: dependence on laser wavelength and temporal beam profile

Cramer, Rainer; Haglund, Richard F.; Hillenkamp, Franz

doi:10.1016/s0168-1176(97)00223-1

Cited by 79 publications

(106 citation statements)

References 18 publications

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“…The maximum values of the laser-induced stresses and the contribution of the so-called photomechanical effects to the material modification and damage are related to the condition of stress confinement [5,78,82,[157][158][159][160]. In systems with relatively slow heat conduction and fast thermalization of the deposited laser energy, the condition for the stress confinement is mainly defined by the laser penetration depth, L p , and the laser pulse duration, τ p .…”

Section: Photomechanical Spallationmentioning

confidence: 99%

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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Summary. Molecular/atomic-level computer modeling of laser-materials interactions is playing an increasingly important role in the investigation of complex and highly nonequilibrium processes involved in short-pulse laser processing and surface modification. This chapter provides an overview of recent progress in the development of computational methods for simulation of laser interactions with organic materials and metals. The capabilities, advantages, and limitations of the molecular dynamics simulation technique are discussed and illustrated by representative examples. The results obtained in the investigations of the laser-induced generation and accumulation of crystal defects, mechanisms of laser melting, photomechanical effects and spallation, as well as phase explosion and massive material removal from the target (ablation) are outlined and related to the irradiation conditions and properties of the target material. The implications of the computational predictions for practical applications, as well as for the theoretical description of the laser-induced processes are discussed. IntroductionShort-pulse lasers are used in a diverse range of applications, from advanced materials processing, cutting, drilling, and surface micro-and nanostructuring [1,2] to pulsed-laser deposition of thin films and coatings [3], laser surgery [4,5], and artwork restoration [6,7], and to the exploration of the conditions for inertial confinement fusion, with the world's most energetic laser system being built at the National Ignition Facility at Lawrence Livermore National Laboratory [8]. At the fundamental science level, short-pulse laser irradiation has the ability to bring material into a highly nonequilibrium state and provides a unique opportunity to probe the material behavior under extreme conditions. In particular, optical pump-probe experiments have been used to investigate transient changes in the electronic structure of the irradiated surface with high (often subpicosecond) temporal resolution [9][10][11][12][13], whereas recent advances in time-resolved X-ray and electron diffraction

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Section: Photomechanical Spallationmentioning

confidence: 99%

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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“…14,33,115,116,155,156 Moreover, observations from scattering experiments for laser ablation of polymer targets by Hare et al 157 suggest that photomechanical effects can lead to the ejection of a relatively intact layer of material that maintains its integrity at least on the time scale of tens of nanosecond. These observations can be related to the spallation of a layer of material observed in the simulations performed under conditions of stress confinement, 68,69,71 Figure 10.…”

Section: Photomechanical Effectsmentioning

confidence: 99%

“…There is, however, a growing number of experimental studies that are specifically aimed at investigating the fundamental processes in laser ablation. In particular, systematic studies of the role of the laser pulse duration, [11][12][13][14] fluence and wavelength, [15][16][17] size of the laser spot, 15 number of successive laser pulses, 18 laser beam incidence angle, 19,20 initial temperature of the molecular substrate, 21 and molecular volatility 22 have been performed. In addition to the yields 11,15,16,21 and velocities 17,[23][24][25][26][27] of the ejected molecules and ions, that are commonly measured in time-of-flight mass spectrometry experiments, other parameters, such as cluster ejection [28][29][30] and profiles of the acoustic signals propagating from the ablation region [31][32][33][34][35][36][37][38][39] have been investigated, providing a more complete picture of the ablation process.…”

Section: Introductionmentioning

confidence: 99%

Computer Simulations of Laser Ablation of Molecular Substrates

Zhigilei

Leveugle

Garrison³

et al. 2003

Chem. Rev.

279

248

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“…In a number of fundamental studies on IR-MALDI the wavelength-tuneable Vanderbilt free-electron laser (FEL) with a different pulse profile was also used [15][16][17]. This laser emits "macropulses" of a few microseconds which actually consist of s-long trains of ca.…”

mentioning

confidence: 99%

“…For IR-MALDI, typically 100 ns-long pulses are switched-out from the FEL macropulse by means of an electro-optical Pockels cell. Pulse trains of up to several microseconds in duration have however also been tested [16,18]. With this laser Cramer et al found a quite strong dependence of the threshold fluence as well as of the temporal signal widths on the laser pulse duration; the latter were found to increase with the duration of the switched-out pulse.…”

mentioning

confidence: 99%

The role of the laser pulse duration in infrared matrix-assisted laser desorption/ionization mass spectrometry

Menzel

Dreisewerd

Berkenkamp

et al. 2002

J. Am. Soc. Mass Spectrom.

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The role of the laser pulse duration in matrix-assisted laser desorption/ionization mass spectrometry with infrared lasers (IR-MALDI-MS) emitting in the 3 m wavelength range has been evaluated. Mass spectrometric performance and characteristics of the IR-MALDI process were examined by comparing a wavelength-tuneable mid-infrared optical parametric oscillator (OPO) laser of 6 ns pulse duration, tuned to wavelengths of 2.79 and 2.94 m, with an Er:YAG laser ( ϭ 2.94 m) with two pulse durations of 100 and 185 ns, and an Er:YSGG laser ( ϭ 2.79 m) with a pulse duration of 75 ns. Threshold fluences for the desorption of cytochrome C ions were determined as a function of the laser pulse duration for various common IR-MALDI matrices. For the majority of these matrices a reduction in threshold fluence by a factor of 1.2-1.9 was found by going from the 75-100 ns long pulses of the Erbium lasers to the short 6 ns OPO pulse. Within the experimental accuracy threshold fluences were equal for the 100 and the 185 ns pulse duration of the Er:YAG laser. Some pronounced pulse duration effects related to the ion formation from a glycerol matrix were also observed. The effect of the laser pulse length on the duration of ion emission was furthermore investigated. (J Am Soc Mass Spectrom 2002, 13, 975-984)

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Matrix-assisted laser desorption and ionization in the OH and CO absorption bands of aliphatic and aromatic matrices: dependence on laser wavelength and temporal beam profile

Cited by 79 publications

References 18 publications

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Computer Simulations of Laser Ablation of Molecular Substrates

The role of the laser pulse duration in infrared matrix-assisted laser desorption/ionization mass spectrometry

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