Agilent - HP 5973 Mass Spectrometer
Agilent HP 5972 Mass Spectrometer
HP 5971 Mass Spectrometer
HP 5970 Mass Spectrometer

This HP GC/MSD is comprised of a HP 6890 GC interfaced to a HP 5972 Mass Selective Detector Quadrupole Mass Spectrometer. The system uses electron impact (EI) ionization and is capable of performing full mass scans or selective ion monitoring (SIM).

Mass Spectrometer:

Full Scan:
- Mass Range: 1.6-700 amu
- Scan Speed: Up to 1800 amu/sec with 1 amu resolution
- Sensitivity: 10pg of Hexachlorobenzene yields a signal to noise of >10:1
Selective Ion Monitoring:
- Mass Range: Up to 50 groups of 30 masses/group
- Sensitivity: 200fg of Hexachlorobezene yields a signal to noise of >10:1

HP 5890 series II 5970 MSD
HP 5970 MSD connected to HP 5890 GC

GMI can provide for all of your analytical mass spectrometry needs. We work carefully with you before the sale to expertly match application within your budget.

Ion-Trap Mass Spectrometry

Introduction

The ion-trap mass spectrometer uses three electrodes to trap ions in a small volume. The advantages of the ion-trap mass spectrometer include compact size and the ability to trap and accumulate ions to increase the signal-to-noise ratio of a measurement.

The mass analyzer consists of a ring electrode separating two hemispherical electrodes. A mass spectrum is obtained by changing the electrode voltages to eject the ions from the trap.

Quadrupole Mass Spectrometry

Introduction

A quadrupole mass filter consists of four parallel metal rods arranged as in the figure below. Two opposite rods have an applied potential of (U+Vcos(wt)) and the other two rods have a potential of -(U+Vcos(wt)), where U is a dc voltage and Vcos(wt) is an ac voltage. The applied voltages affect the trajectory of ions traveling down the flight path centered between the four rods. For given dc and ac voltages, only ions of a certain mass-to-charge ratio pass through the quadrupole filter and all other ions are thrown out of their original path. A mass spectrum is obtained by monitoring the ions passing through the quadrupole filter as the voltages on the rods are varied. There are two methods: varying w and holding U and V constant, or varying U and V (U/V) fixed for a constant w.

Quadrupole mass spectrometers consist of an ion source, ion optics to accelerate and focus the ions through an aperture into the quadrupole filter, the quadrupole filter itself with control voltage supplies, an exit aperture, an ion detector, detection electronics, and a high-vacuum system.

Agilent HP 5973 Mass Spectrometer
Agilent HP 5972 Mass Spectrometer
Hewlett Packard 5971 Mass Spectrometer
Hewlett Packard 5970 Mass Spectrometer

Count on GMI for all of your GC and GC-MSD analytical instrumentation such as HP 5890 series II 5971 MSD or even current model
HP / Agilient 6890 5973N (networked). Because we work carefully with you before the sale to determine the best fit of your application and budget we don't list prices on our web for these products. We are happy to provide a pricing proposal based on your needs. We can provide installation and training as required.

$ Inquires at 763-712-8717

Basic principle of operation:

Mass spectrometers use the difference in mass-to-charge ratio (m/e) of ionized atoms or molecules to separate them from each other. Mass spectrometry is therefore useful for quantitation of atoms or molecules and also for determining chemical and structural information about molecules. Molecules have distinctive fragmentation patterns that provide structural information to identify structural components.

The general operation of a mass spectrometer is:

create gas-phase ions
separate the ions in space or time based on their mass-to-charge ratio
measure the quantity of ions of each mass-to-charge ratio

The ion separation power of a mass spectrometer is described by the resolution, which is defined as:
R = m / m,
where m is the ion mass and m is the difference in mass between two resolvable peaks in a mass spectrum. E.g., a mass spectrometer with a resolution of 1000 can resolve an ion with a m/e of 100.0 from an ion with an m/e of 100.1.

Instrumentation

In general a mass spectrometer consists of an ion source, a mass-selective analyzer, and an ion detector. Since mass spectrometers create and manipulate gas-phase ions, they operate in a high-vacuum system. The magnetic-sector, quadrupole, and time-of-flight designs also require extraction and acceleration ion optics to transfer ions from the source region into the mass analyzer. The details of mass analyzer designs are discussed in the individual documents listed below. Basic descriptions of sample introduction/ionization and ion detection are discussed in separate documents on ionization methods and ion detectors, respectively.

A typical configuration consists of a gas chromatograph (GC) with a quadrupole mass spectrometer (MS) as a detector (Alternatively, an ion trap detector (or TOF time of flight) may be employed). In the normal mode of operation, a sample consisting of a mixture of organic compounds which are volatile at a temperature of 275 degrees C is introduced to the head of the column with a syringe. Helium serves as a carrier gas to move the sample through the column. During passage through the column (a fused silica capillary with a wall coating of a thermally stable, non-volatile liquid), the mixture is separated into individual components. As each component issues from the column, it is introduced to the mass spectrometer where a mass spectrum for that material is obtained and stored in a computer. The spectrum is interpreted, either manually or by a computer search, to identify the compound.

Other MSD inventory:

HP 5971, HP 5972, HP 5973N

Accepting all major credit cards:		At GMI...its instrumental !
GMI, Inc. 6511 Bunker Lake Blvd. Ramsey, Minnesota, 55303 USA Tel. 763-712-8717 Fax 763-712-8724 Send electronic mail to richard@gmi-inc.com
Copyright � 1998 - 2006 This page and all associated pages (web archived and all other) (and their HTML) of this website and all content at www.gmi-inc.com are the sole property of Global Medical Instrumentation, Inc. and are protected by GMI copyright protection laws and may not be reproduced in any form nor may any content or any images be removed without the owner's express written permission. All instruments mentioned on our web site are the trademarks of their respective manufacturer. GMI, Inc. makes no claims of special affiliation with or special sanctions by the original manufacturers or their respective trademarks. The appearance of those names is not intended to imply that GMI is an officially authorized dealer or distributor for those manufacturers . Purchases are subject to GMI Terms and Conditions of Sale found on our Contact and Ordering page. ***Inventory changes daily, please call for availability and for items not seen or listed. We look forward to hearing from you!