Axis BTA 2100D Manual do Operador descarregar pdf (Página 186)

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Excitation Storage Level Rf storage level in m/z when the dissociation

waveform is applied following isolation. The

excitation storage level range depends on the parent

mass, but the storage level must lie more than 2

mass units below the lowest product ion value.

Excitation Amplitude Range for nonresonant excitation is 0 to 100 volts.

For resonant excitation, the range is 0 to 60 volts.

Default values for nonresonant excitation is 20 volts

and 0.2 volts for resonant excitation.

Ionization Storage Level The m/z value the rf is maintained at during

ionization and the coarse isolation. Range 35 to 160

m/z, default = 48 m/z.

Item Description

Ejection Amplitude Amplitude (v) of the ejection waveform during the

coarse isolation step. Range 0 to 60 volts,

default=20.

Low Edge Offset Integer value step to optimize the ejection of the

mass just below the parent ion mass. Range is 0 to

20 steps. The default value is 6.

High Edge Offset The integer value step to optimize the ejection of the

mass just above the parent ion mass. Range is -20 to

20 steps.

High Edge Amplitude Amplitude of broadband waveform use to eject

masses above the isolated parent ion. Default is 30

volts.

Isolation Time The dwell time during which the rf field is held

constant in the high mass ejection step. Range 1 - 10

msec.

Excitation Time Time for collision-induced dissociation (CID) by ion

excitation. Range 0 to 1000 msec. The default is 20

msec.

Modulation Range Mass range over which the rf storage field is

modulated during resonant CID. The range is 0 to 10

steps, default is 2 steps. Value of 0 gives a fixed rf

storage field, i.e., no modulation.

Modulation Rate The number of microseconds that will be spent at

each step. The range is 29 usec to 5600 usec,

default is 3000 usec/step.

Number of Frequencies Enter an odd integer in the range of 1 to 121. A

frequency number of one generates a single

supplementary frequency applied to the end caps. An

integer of 3, generates three frequencies: the

resonance frequency and frequencies 500 Hz above

and below that frequency.

CID Frequency Offset To offset the dissociation frequency. The CID

frequency can be adjusted between  3000 Hz.

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