Voyager DP-263-S Betriebsanweisung Seite 567

  • Herunterladen
  • Zu meinen Handbüchern hinzufügen
  • Drucken
  • Seite
    / 612
  • Inhaltsverzeichnis
  • FEHLERBEHEBUNG
  • LESEZEICHEN
  • Bewertet. / 5. Basierend auf Kundenbewertungen
Seitenansicht 566
Voyager
Biospectrometry
Workstation User’s Guide Glossary-1
Glossary
G
O
S
S
L
A
R
Y
a, b, and c ions
—Generic
description of potential ions that are
formed by fragmentation of a parent
peptide/protein. a, b, and c ions are
fragments that retain the charge at the
amino end (n-terminus) of the molecule.
See also x, y, z ions.
ASCII
—American Standard Code for
Information Interchange. A file format
that contains codes that constitute the
128-character ASCII set, and allows
exchange of data between information
processing systems, communication
systems, and associated equipment.
Accelerating voltage
Potential difference between the ion
source and ground, used to accelerate
ions. Actual acceleration in a TOF
instrument usually occurs in the first 1 to
2 cm of the flight tube. Ions then drift the
remaining flight tube distance.
Arcing
—Electrical discharge
between two points. Usually occurs
when a high potential difference exists
between two points.
BA1 and BA2 (Bayard
Alpert vacuum gauges)
Pressure gauges that operate below
1 millitorr by measuring a positive ion
current produced by electrons from a
hot filament. Voyager-DE systems
include BA1 only.
Beam Guide Wire
—See Guide
Wire Voltage.
Centroid%
—Percentage of the
peak height examined during peak
identification. For example, with a
Centroid% of 10, the software examines
the top 10 percent of the signal.
CID
—Collision-induced dissociation—
A technology that enhances
fragmentation for PSD analysis. As ions
leave the source, they pass through a
collision cell, interact with collision gas
molecules, and energy is transferred to
the ions. This transfer of energy
enhances fragmentation.
Continuous Extraction
Formation of ions in a strong electrical
field, with immediate acceleration. Used
for diagnostic purposes.
Daughter ion
—See Product ion.
Delayed Extraction
Formation of ions in a weak electrical
field, with subsequent acceleration by
application of a high voltage pulse after
a predetermined time delay.
CH—CO—NH—CH
Rn
Rn+1
an bn cn
Seitenansicht 566
1 2 ... 562 563 564 565 566 567 568 569 570 571 572 ... 611 612

Kommentare zu diesen Handbüchern

Keine Kommentare