Laser-Induced Emission of Electrons, Ions, and Neutral Atoms From Solid Surfaces

Honig, Richard E.; Woolston, J. R.

doi:10.1063/1.1753812

Cited by 181 publications

(51 citation statements)

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“…Исследование эмиссии электронов, сопровождающей этот процесс, стало возможным практически сразу после начала широ-кого использования лазеров в экспериментальной физи-ке [4]. В первых экспериментах с лазерными импульсами достаточно большой длительности нелинейные по полю эффекты не были обнаружены, поскольку возникновение электронной эмиссии вызывалось нагреванием мишени, т. е. процесс сводился к термоэмиссии [5][6][7]. С появ-лением технологии уменьшения длительности лазер-ных импульсов картина эмиссии существенно меняется.…”

Section: Introductionunclassified

Спектр Электронов При Холодной Нелинейной Эмиссии Из Металла Под Действием Лазерного Импульса

Головинский¹,

Михин²

2017

Журнал Технической Физики

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Рассмотрена нелинейная эмиссия электронов из металла под действием фемтосекундного лазерного импульса умеренной интенсивности. Построена теоретическая модель процесса на основе одномерного нестационарного уравнения Шредингера в полупространстве вакуума с заданными граничными условиями для волновой функции электрона, при решении которого применяется преобразование Лапласа. Считается, что лазерное поле слабо возмущает состояния свободных электронов в металле, описываемые в рамках теории металлов Зоммерфельда. Получен энергетический спектр вылетевших электронов и исследована его зависимость от параметров лазерного импульса. Результат расчета спектра нелинейной эмиссии электронов из вольфрамовой наноиглы под действием лазерного импульса с напряженностью 9.26 V/nm и длительностью 6.5 fs согласуется с экспериментальными данными.

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Section: Introductionunclassified

Спектр Электронов При Холодной Нелинейной Эмиссии Из Металла Под Действием Лазерного Импульса

Головинский¹,

Михин²

2017

Журнал Технической Физики

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“…15 They coupled a laser with a double-focusing Mattauch-Herzog mass spectrometer (MS 7). The duration of the laser pulse was 50 microseconds: 2 × 10 17 atoms were vaporised and 2 × 10 14 ions were created.…”

Section: Historical Perspective Of the Development Of Direct-samplingmentioning

confidence: 99%

Can Laser-Ionisation Time-of-Flight Mass Spectrometry Be a Promising Alternative to Laser Ablation/Inductively-Coupled Plasma Mass Spectrometry and Glow Discharge Mass Spectrometry for the Elemental Analysis of Solids?

Сысоев

2002

Eur J Mass Spectrom (Chichester)

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At the beginning of the age of laser-ionisation mass spectrometry (LIMS) increasing numbers of publications were observed. However, later the method began to run into obstacles associated with poor reproducibility of analysis and large variations in elemental sensitivities so that the wide interest of the scientific community in the method faded away. However, the results described here show that the current knowledge of laser plasma processes, together with modern technical solutions to ion separation and quantification with time-of-flight (ToF) mass spectrometry, allow one to overcome the above-mentioned obstacles in LIMS. Thus, the performance in direct-sampling solid analysis demonstrated by the LAMAS-10M instrument is similar to that typically obtained by laser ablation/inductively-coupled plasma mass spectrometry (LA-ICP-MS) and glow-discharge mass spectrometry (GD-MS) methods. At the same time, there are additional advantages, including compactness of the instrument, absence of the need for expensive consumables and freedom from mass line interferences. Direct-sampling elemental LIMS is discussed as a promising alternative to LA-ICP-MS and GD-MS. Existing and prospective approaches to designing direct-sampling laser-ionisation mass spectrometers are theoretically justified. Factors affecting the main performance criteria, such as reproducibility, correctness, variations of relative sensitivity factors, linear dynamic range and resolution are considered. The demonstrated reproducibility, resolution, low-ppb limit of detection and one order-of-magnitude variation in elemental sensitivity are not the limit for direct-sampling laser-ionisation mass spectrometry of solid samples. Ways of improving LI-ToF-MS instrumental performance are discussed and theoretically justified.

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“…LIMS is a sensitive technique, nevertheless, it is still considered to be semiquantitative [11,21,22], in spite of its long development history [23]. Complexities introduced by the ablation process make the quantitative analysis sometimes difficult because of ion yield dependence on laser irradiance, wavelength, pulse duration, or physical properties of the material (morphology, homogeneity).…”

Section: Introductionmentioning

confidence: 99%

On Applicability of a Miniaturised Laser Ablation Time of Flight Mass Spectrometer for Trace Elements Measurements

Tulej

Riedo

Iakovleva

et al. 2012

International Journal of Spectroscopy

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We present results from mass spectrometric analysis of NIST standard materials and meteoritic samples conducted by a miniaturised laser ablation mass spectrometer designed for space research. The mass analyser supports investigation with a mass resolution (m/Δm) ≈ 500-600 and dynamic range within seven decades. Nevertheless, to maintain an optimal spectral quality laser irradiances lower than ∼1 GW/cm 2 are applied so far which results in a spread of RSC values. To achieve the quantitative performance of mass analyser, various effects influencing RSC factors have to be investigated. In this paper we investigate influence of laser irradiance, sampling procedure and plasma chemistry on the quantitative elemental and isotopic analysis. The studies indicate necessity for accurate control of laser characteristics and acquisition procedure. A relatively low irradiance applied causes a negligible sample damage and allows for accumulation of large number of waveforms from one sample location. The procedure yields statistically well averaged data and allows a sensitive in-depth analysis. The quantitative analyses of isotopic composition can be performed with accuracy and precision better as 1% and 2%, for isotopic patterns of elements and clusters, respectively. The numerical integration methods would be preferred to achieve more accurate results. The measurements of Allende sample yield detection of Pb isotopic pattern, nevertheless cluster species are readily observed in spectrum and make the elemental analysis of other trace elements difficult due to isobaric interferences. These detections are of a considerable interest because of possible application of the instrument for in situ elemental and isotopic analysis and radiometric dating of solids.

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Laser-Induced Emission of Electrons, Ions, and Neutral Atoms From Solid Surfaces

Cited by 181 publications

References 0 publications

Спектр Электронов При Холодной Нелинейной Эмиссии Из Металла Под Действием Лазерного Импульса

Спектр Электронов При Холодной Нелинейной Эмиссии Из Металла Под Действием Лазерного Импульса

Can Laser-Ionisation Time-of-Flight Mass Spectrometry Be a Promising Alternative to Laser Ablation/Inductively-Coupled Plasma Mass Spectrometry and Glow Discharge Mass Spectrometry for the Elemental Analysis of Solids?

On Applicability of a Miniaturised Laser Ablation Time of Flight Mass Spectrometer for Trace Elements Measurements

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