Axis BTA 2100D Manual do Operador descarregar pdf (Página 216)

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NOTE: If the excitation amplitude used is too large, the parent ion and product

ion spectra will be absent because both ions will be ejected from the trap. If the

value is too small, the parent ion spectrum will be dominant and the product ion

spectrum will be weak or missing.

The MS “q” Calculator

For convenience, The MS q Calculator is available in all Ion Preparation Options.

Storage rf values are often reported in terms of the Mathieu “q” parameter in the

scientific literature. The value of the “q” parameter determines the stability of the

parent ion trajectory. More stable trajectories allow higher excitation voltages to

be applied before ions are ejected from the trap. It has been empirically observed

that a “q” value of 0.4 provides an optimum yield of product ions. This calculator

utility determines the corresponding CID storage rf value (m/z) following user

entry of an ion mass (m/z) and desired “q”.

NOTE: Right click of the mouse on the “q” calculator button provides a “q” to “”

calculator.

Customize Non-resonant Method

The parameters in the MS/MS Ion Prep Method Editor window are the basic

ones needed to create a MS/MS Ion Prep Method file. For the vast majority of

applications, no other information is required. However, some applications may

require further customization.

NOTE: Be sure that you have specified the parent ion mass before opening the

Customize Parameters window.

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