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光谱分析

(2009-09-16 08:57:31)
标签:

光谱仪

单色仪

杂谈

分类: 光谱仪分析

Laser Induced Plasma Spectroscopy in Metals with High-Atomic-Number

激光诱导高原子序数金属介质的等离子体光谱分析

 

To go down to one nm you have to use a grazing incidence spectrometer. They are either fixed focal plane instruments with corrected gratings, most of which do not go down to 1 nm. The Model 248/ 310G Grazing Incidence Spectrometer will cover their range with grating changes and angle changes. The resolution you gave me in eV I do not think is accurate since 0.05 eV at 1 nm is a resolution of 0.00043 nm. Of course at 310 nm it is a resolution of 3.92 nm.

测量波长范围低至1纳米时,需要采用一台掠入射光栅光谱仪。它们是带有校正光栅的固定焦面仪器,但绝大多数不能测量1纳米的波长。Model 248/310G 型掠入射光栅光谱仪可以通过更换光栅及调整角位,从而覆盖所需的波长范围。0.05电子伏在1纳米时的分辨率为0.00043纳米。当然在310纳米时,其分辨率为3.92纳米。

Entrance slit and the grating are fixed and the exit slit scans across the Rowland circle. You can change the angle you are hitting the grating at by changing an adapter.入射狭缝及光栅固定起来,出射狭缝扫描过罗兰圆。可以通过更换适配器调整角位。

By changing the angle you change the blaze of the grating and the coverage at the focal plane. The dispersion does change with wavelength. The instrument can be equipped with an MCP Detector assembly to do timed measurements. By this what I mean is the MCP can be pulsed, but the fastest pulse that we can provide is 100 ns. For a complete system with a pulsed MCP and pumping system. 通过调整角位,可以改变光栅闪耀及波长覆盖范围。色散改变波长范围。该设备配备MCP探测器组件(MCP Detector assembly),能做分时测量。MCP可以脉冲调节,但最快的脉冲为100ns。整套带脉冲MCP探测器及泵浦系统可以提供。

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