Voyager DP-263-S Uživatelská příručka stáhnout pdf (Strana 332)

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Chapter 6 Acquiring Mass Spectra

6-20 PerSeptive Biosystems

6.3 Obtaining Good Spectra

in Delayed Extraction Mode

This section describes:

• What is a good spectrum?

• Laser intensity

• Parameters affecting resolution and signal-to-noise ratio

6.3.1 What is a Good Spectrum?

A good spectrum is one that is acceptable for your analysis. In

general, it:

• Contains sharp, symmetrical, well-defined peaks

• Has acceptable resolution

• Has acceptable signal-to-noise ratio

For some applications (for example, when you are looking for

detailed structural information), you may require very

well-separated isotope peaks and the maximum resolution

possible. For other applications (for example, when looking for

an estimate of molecular weight), your requirements may be

less strict.

Figure 6-6 through Figure 6-9 are examples of poor and good

spectra.

NOTE: Masses are typically accurate in Delayed Extraction

mode, even at high laser power.

NOTE: Dimers in a spectrum may indicate that the

molecular ion is saturated, or that sample is too

concentrated. Decrease laser intensity or sample

concentration to minimize the dimer.

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