Generation of a long wedge-shaped barium atomic beam and its density characterization

Majumder, A.; Jana, Biswajit; Kathar, P. T.; Das, Sudip Kumar; Mago, V. K.

doi:10.1016/j.vacuum.2008.11.011

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…They are (i) a resistively heated furnace for generation of a long wedge-shaped atomic beam, (ii) a HCL-based optical absorption set-up to measure the average neutral atom density in the atomic beam, (iii) a laser system to produce a finite-sized photoplasma inside the atomic beam, (iv) an electrostatic ionextractor for collection of photoions from the photoplasma etc. Details of the experimental set-up are discussed in [20,21] and here only a brief description of various subsystems is presented. The furnace and ion-extractor assemblies are kept inside a stainless steel vacuum chamber.…”

Section: Methodsmentioning

confidence: 99%

“…The lid has a linear array of 31 cylindrical channels/tubes, which are drilled along the length of the crucible. The apertures of channels (or holes in the lid) are of different shapes and sizes are discussed in detail in [21]. The middle hole is oval shaped with 6 mm length and 2 mm width.…”

Section: Atomic Vapor Sourcementioning

confidence: 99%

“…The vapors are collimated by a rectangular slit of 100 mm × 8 mm and this forms a long extended wedge-shaped atomic beam expanding in the vertical direction. The beam was characterized in our previous work [21]. The atomic beam has a length ∼100 mm and width ∼20 mm at the laser-atom interaction region, which is nearly 70 mm above the crucible lid.…”

Section: Wedge-shaped Atomic Beammentioning

confidence: 99%

See 2 more Smart Citations

Measurement of photoionization yield in low-density barium photoplasma study

Jana¹,

Kathar²,

Majumder³

et al. 2013

Meas. Sci. Technol.

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A finite-sized barium (Ba) photoplasma is generated through a two-step resonant photoionization method by shining laser pulses onto an atomic beam of Ba. The photoionization yield is estimated from the ratio of photoion density to neutral atom density measured in the laser–atom interaction region. The neutral atom density in the atomic beam is measured by an optical absorption technique where a Ba hollow cathode lamp (Ba-HCL) is used as an emission source. Since the photoplasma has a finite volume and it is pulsed in nature, the photoion density in the photoplasma is estimated through the collection of charge from the photoplasma. The measured ionization yield is compared with the calculated value that is obtained from an in-house developed code. It is observed that the values are in good agreement.

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Section: Methodsmentioning

confidence: 99%

Section: Atomic Vapor Sourcementioning

confidence: 99%

Section: Wedge-shaped Atomic Beammentioning

confidence: 99%

See 1 more Smart Citation

Measurement of photoionization yield in low-density barium photoplasma study

Jana¹,

Kathar²,

Majumder³

et al. 2013

Meas. Sci. Technol.

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“…One goal being to produce an intense ion or electron beam once ionized. [11][12][13][14] Similar goals for other atoms are pursued in many groups, for instance, Ca, 15 Sr, 16,17 Yb, 18 Ba, 19 Li, 4 and Rb. 20 A systematic study on any atom might thus be useful for the atomic physics community as a whole.…”

Section: Introductionmentioning

confidence: 93%

Comparative analysis of recirculating and collimating cesium ovens

Hahn

Thomas

Boucher

et al. 2022

Review of Scientific Instruments

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We have performed a study of several cesium oven designs. A comparison between recirculating (or sticking-wall) and collimating (or re-emitting-wall) ovens is made in order to extract the most efficient design in terms of beam brightness. Unfortunately, non-reproducible behaviors have been observed, and the most often observed output flux is similar to the sticking-wall case, which is the lowest theoretical value of the two cases, with a beam brightness close to 1018 at. sr−1 s−1 cm−2. The reason of this universally observed behavior is unclear despite having tested several materials for the collimating tube. Conclusion on possible improved design based on sticking of cesium on several (un)cleaned surfaces is given.

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“…实验室青年基金(批准号：AHL2021QN01)。 † 通讯作者.E-mail: zscao@aiofm.ac.cn 第一作者.E-mail: qigang@mail.ustc.edu.cn 1 引言同位素分析与丰度测量在卫星导航、考古定年、核能利用以及生物医学等研究中具有重要的应用 [1] 。例如，铷(Rubidium，简记为 Rb)作为一种化学性质活泼的碱金属，主要包括 85 Rb 和 87 Rb 两种天然同位素，常以化合物形式存在。由于 87 Rb 会通过 β-衰变生成 87 Sr (Strontium，简记为 Sr)，因此地质学者常通过获取样品的 87 Sr 含量测定目标地区的地质年龄(Rb-Sr 法) [2] 。 87 Rb 的辐射频率还具有长时间的稳定性，常被作为标准频率 [3] ，而 87 Rb 丰度大小直接决定了原子钟频率的准确性。此外，铷也是 235 U 裂变产物之一， 235 U 裂变会释放约 2.55% 的 87 Rb 和 1.32% 的 85 Rb，可被用来监测敏感地区核污染与核活动 [4] 。因此，对铷同位素比进行定量检测与分析具有重要意义和应用价值。现有的铷同位素分析方法通常以质谱技术为金标准。如丹麦岩石圈研究中心 Waight 等 [5] 使用热电离质谱仪对铷同位素组成进行测定，分析精度达 1.3%；中科院地球化学研究所张卓盈等 [6] 利用 Sr-Spec 树脂实现了从基体中对铷元素的纯化分离，并利用多接收电感耦合等离子体质谱仪实现对铷、钾和锶等同位素测量，分析精度优于 0.06‰。质谱技术可对多组分样品同步进行检测，测量精度高，但受限于样品复杂的预处理过程，以及仪器体积庞大，导致该技术不适用于在线与快速测量。同位素成分除质量不同外，其电子能级结构也有不同 [7] ，同位素间能级跃迁的位移量也存在差异，因此可利用高分辨光谱技术检测同位素吸收光谱，进而反演其同位素比。其中，固体样品待测元素的气态原子化是能否利用吸收光谱技术进行金属同位素检测的关键，国内外课题组多以脉冲激光烧蚀样品诱导产生等离子体，如美国佛罗里达大学的 King 等 [4] 利用脉冲激光烧蚀固体碳酸铷 (Rubidium Carbonate, 简记为 Rb 2 CO 3 )样品诱导产生等离子体，同步使用吸收光谱技术获得铷的同位素比，测量结果为 2.7±0.2；中科院安徽光机所叶浩等 [8] 利用激光烧蚀样品结合原子吸收光谱技术，通过实验获得最佳实验条件，得到了铀的同位素丰度信息。该类型测量装置操作不复杂，可以实现纳克级样品的检测。然而，由于烧蚀激光脉冲之间能量波动起伏，使得测量稳定性不够理想；且烧蚀过程中产生的瞬态温度高达 5000-20000 K [9] ，导致待测原子/离子光谱线宽增大，使得部分吸收峰之间难以区分，降低了探测装置的光谱分辨能力。通过对金属材料的原子发生器施加电流，利用电阻加热的方式产生高温，使待测样品达到分解的温度来获取目标单质，是一种新型的金属原子化手段 [10]…”

Section: 基金：国家自然科学基金重大科研仪器研制项目(批准号：42027804)、先进激光技术安徽省unclassified

Measurement of Rb isotope ratio by atomic absorption spectroscopy with multi-microchannel array structure cavity

Qi¹,

Huang²,

Fei-Tong³

et al. 2023

Acta Phys. Sin.

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Rubidium isotope analysis has important application value in geological exploration and environmental detection. Based on tunable laser atom absorption spectroscopy technology combined with thermal decomposition of the sample, a rubidium isotope absorption spectroscopy measurement device is bulit to realize rubidium isotope ratio stability detection. And the atomic generator is designed by a new micro-channel array structure, which enhances atomic beam collimation capability, effectively suppresses the doppler effect of the spectrum and improves the resolution of rubidium isotope absorption spectrum. The device adopts tantalum metal to make the atomic generator with a diameter of 6 mm, and the micro-channel array with a diameter of 1 mm is stacked inside the atomic generator which can be heated resistively to 3000 ℃. In this experiment, the rubidium carbonate sample is catalyzed to release rubidium atom beam at high temperature (600 ℃), while a probe laser is used to obtain high resolution rubidium absorption spectrum. The rubidium isotope ratio (85Rb: 87Rb) of natural abundance rubidium carbonate samples is 2.441±0.02 by combining the inversion of the spectral line parameters, the detection error is 4.8%, and the detection limit of 87Rb is 1.76‰ (3σ). The experimental results show that the multi-microchannel structure reduces the linewidth of rubidum atoms by 450 MHz (half height full width) compared to the single-channel structure, which can effectively distinguish the absorption characteristics of rubidium isotopes. The device has a high detection accuracy and a high spectral resolution, allowing for a possibility for the measurement of metal isotope abundance analysis, which has a broad application prospect.

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Generation of a long wedge-shaped barium atomic beam and its density characterization

Cited by 10 publications

References 22 publications

Measurement of photoionization yield in low-density barium photoplasma study

Measurement of photoionization yield in low-density barium photoplasma study

Comparative analysis of recirculating and collimating cesium ovens

Measurement of Rb isotope ratio by atomic absorption spectroscopy with multi-microchannel array structure cavity

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