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质谱仪中的激光是如何产生的?

同位素及其它无机质谱

  • 据说最早的激光是用红宝石产生的,不知质谱仪中的激光是怎么生成的?质谱的激光器使用寿命是多久呢?我们的TOF-TOF好像没有能量了!
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  • qhum

    第2楼2006/09/10

    谈到质谱仪中的激光,那讨论的只能是MALDI(matrix-assisted laser desorption /ionization) mass spectrometer. If you have just a commercial instrument, you may not know exactly where the laser comes from. In the following, I will give you some ideas about the laser in the MALDI MS.

    1. The most commonly used laser in MALDI now is N2 laser. wave length=337nm. less then 50 Hz. This kind of laser is very economic. It can last for about one year at least. If you feel there is no much energy in your laser, it's much easier to change the cartridge of the laser. You don't need to buy a new laser.

    2. Another other type of laser in the UV range is Nd:YAG laser. wavelength=355 nm. Its frequency is much higher than N2 laser. It can goes up to 10 kHz.
    3. For the laser working in IR range. It is normally CO2 laser. The wavelength is around 2 um.

    You should keep in mind that for the UV and IR laser, they use different matrices.

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  • lovelisten

    第3楼2006/09/16

    先看看激光原理方面的书普及一下基本知识。激光有YAG,半导体,气体,准分子激光等。这几种激光都可以用在质谱上。你看看你的激光是哪个厂家的,找到它的说名书一看就知道。做质谱的不可能做激光,激光都是质谱厂家从激光器厂家给配套的。

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  • 徐好狗

    第5楼2006/09/17

    找 ABI买大概200kRMB,找老毛子买13kUSD,北京有代理
    LCM-DTL-374QT
    自己不会换就多画点钞票了,买了宝马不会没有油钱吧?

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  • maldiguy

    第6楼2006/10/30

    老毛子在北京的联系方式是多少,包alignment么

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