Gas Desorption Produced by a Giant Pulse Laser

Levine, Leonard; Ready, John F.

doi:10.1063/1.1708977

Cited by 57 publications

(3 citation statements)

References 6 publications

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“…LDI mass spectrometry has been around since the early 1960s, shortly after the invention of the laser in the 1950s. Levine, J. F. Ready, E. Bernal, W. I. Linlor, R. E. Honig, and J. R. Woolston were some of the researchers who first explored desorption plume dynamics and used this technique to develop high-sensitivity mass spectrometers [ 98 , 99 , 100 , 101 , 102 , 103 ]. As time passed and the adaptations and improvements to LDI developed, more researchers began to use it and, incidentally, it became the foundation of MALDI after early experiments from Hillenkamp et al [ 104 ].…”

Section: Msi Ionization Techniques To Investigate Plant–microbe Inter...mentioning

confidence: 99%

Mass Spectral Imaging to Map Plant–Microbe Interactions

Parker

Hanley

2023

Microorganisms

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Plant–microbe interactions are of rising interest in plant sustainability, biomass production, plant biology, and systems biology. These interactions have been a challenge to detect until recent advancements in mass spectrometry imaging. Plants and microbes interact in four main regions within the plant, the rhizosphere, endosphere, phyllosphere, and spermosphere. This mini review covers the challenges within investigations of plant and microbe interactions. We highlight the importance of sample preparation and comparisons among time-of-flight secondary ion mass spectroscopy (ToF-SIMS), matrix-assisted laser desorption/ionization (MALDI), laser desorption ionization (LDI/LDPI), and desorption electrospray ionization (DESI) techniques used for the analysis of these interactions. Using mass spectral imaging (MSI) to study plants and microbes offers advantages in understanding microbe and host interactions at the molecular level with single-cell and community communication information. More research utilizing MSI has emerged in the past several years. We first introduce the principles of major MSI techniques that have been employed in the research of microorganisms. An overview of proper sample preparation methods is offered as a prerequisite for successful MSI analysis. Traditionally, dried or cryogenically prepared, frozen samples have been used; however, they do not provide a true representation of the bacterial biofilms compared to living cell analysis and chemical imaging. New developments such as microfluidic devices that can be used under a vacuum are highly desirable for the application of MSI techniques, such as ToF-SIMS, because they have a subcellular spatial resolution to map and image plant and microbe interactions, including the potential to elucidate metabolic pathways and cell-to-cell interactions. Promising results due to recent MSI advancements in the past five years are selected and highlighted. The latest developments utilizing machine learning are captured as an important outlook for maximal output using MSI to study microorganisms.

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Section: Msi Ionization Techniques To Investigate Plant–microbe Inter...mentioning

confidence: 99%

Mass Spectral Imaging to Map Plant–Microbe Interactions

Parker

Hanley

2023

Microorganisms

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“…Figure 8b reveals that the luminescence intensity decreases by approximately 38% after approximately 50 min of laser irradiation. This result can be understood in terms of the LITD of U(VI) surface species by the following processes: (1) when a portion of the laser pulse energy is absorbed into the surface, the localised surface heating induces thermal desorption of adsorbed species; and (2) the desorption of adsorbed U(VI) surface species results in an immediate decrease in the luminescence intensity [45][46][47][48]. The suitability of LITD as a cause of the laser-induced reaction was demonstrated by monitoring the desorbed U(VI) from the surface.…”

Section: Excitation Wavelength-and Pulse Energy-dependent Luminescenc...mentioning

confidence: 99%

Surface Coverage- and Excitation Laser Wavelength-Dependent Luminescence Properties of U(VI) Species Adsorbed on Amorphous SiO2

Jung

Kim

et al. 2022

Minerals

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Time-resolved luminescence spectroscopy is usefully used to identify U(VI) surface species adsorbed on SiO2. However, the cause of the inconsistent luminescence lifetimes and spectral shapes reported previously remains undetermined. In this study, the U(VI) surface coverage (Γ) and excitation laser wavelength (λex) were examined as the predominant factors governing the luminescence properties of U(VI) surface species. At neutral pH, the luminescence lifetimes of U(VI) surface species increased with decreasing Γ. In the low-Γ region, where a relatively large number of adjacent surface sites are involved in the formation of multidentate surface complexes, the displacement of more number of coordinated water molecules in the equatorial plane of U(VI) results in a longer lifetime. The pH-dependent luminescence lifetimes of U(VI) surface species at the same U(VI) to SiO2 concentration ratio in the pH range of 4.5–7.5 also explain the effect of the surface binding sites on the luminescence lifetime. The time-resolved luminescence properties of the U(VI) surface species were also investigated at different excitation wavelengths. Continued irradiation of the SiO2 surface with a UV laser beam at λex = 266 nm considerably reduced the luminescence intensities of the U(VI) surface species. The higher the laser pulse energy, the greater the decrease in luminescence intensity. Laser-induced thermal desorption (LITD) of U(VI) surface species is suggested to be the origin of the decrease in luminescence intensity. LITD effects were not observed at λex = 355 and 422 nm, even at high laser pulse energies.

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“…aucun dégât, mais il se produit une élévation de température. Les variations de pression observées dans l'enceinte ainsi que l'étude des particules émises, prouvent qu'il y a désorption et ionisation des espèces neutres fixées superficiellement [8]. Dans certains cas.…”

Section: Dispositif De Concentration D'énergie -Leunclassified

Interaction d'un faisceau laser avec une cible métallique - Première partie Étude de l'échauffement et de la vaporisation de la cible

Dumas

1970

Rev. Phys. Appl. (Paris)

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Les dégâts provoqués sur une cible métallique, sous vide, par focalisation d'un faisceau lumineux issu d'un laser à rubis, sont fonction de l'énergie et de la durée d'impulsion lumineuse (dans le domaine de 2 x 10-7 s à 2 × 10-6 s et de 1 à 300 mJ). 1. Lorsque l'énergie est insuffisante pour vaporiser les couches traversées, la propagation du front thermique n'a que des effets d'échauffement se traduisant par une modification de l'état de surface et la désorption des contaminants superficiels. 2. Lorsque l'énergie atteint une valeur seuil, 0,01 Joule délivré en 0,8μs (soit environ 107 W/cm2), un cratère est formé, la pénétration du front thermique s'accompagnant alors de la vaporisation du matériau. 3. Les dimensions de ce cratère (profondeur, diamètre) augmentent avec l'énergie lumineuse, mais en tendant vers des valeurs limites pour des énergies de dix à cent fois supérieures au seuil. On peut rendre compte de ce phénomène de saturation en considérant les vitesses relatives de pénétration de la chaleur et de propagation du front de vaporisation dans le matériau. Le modèle proposé permet de calculer la quantité de matière vaporisée (de l'ordre du microgramme) en fonction des paramètres de l'impulsion lumineuse et des propriétés physiques de la cible. 4. Au-delà du seuil, si la profondeur du cratère reste sensiblement constante, par contre la projection du matériau est plus violente

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Gas Desorption Produced by a Giant Pulse Laser

Cited by 57 publications

References 6 publications

Mass Spectral Imaging to Map Plant–Microbe Interactions

Mass Spectral Imaging to Map Plant–Microbe Interactions

Surface Coverage- and Excitation Laser Wavelength-Dependent Luminescence Properties of U(VI) Species Adsorbed on Amorphous SiO2

Interaction d'un faisceau laser avec une cible métallique - Première partie Étude de l'échauffement et de la vaporisation de la cible

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