QASoft is the automatic quantitative analysis program developed by Infrared Analysis, Inc. that enables the measurement of all infrared-active gases. The program can be operated with many types of FT-IR spectrometers and long path optical systems.

QASoft uses the spectroscopist's traditional method of comparing band areas in sample and reference spectra. With a computer doing the comparisons rather than a human operator, the analyses are faster and more accurate, and the computer can immediately subtract the measured spectrum from the sample spectrum. The data system then can proceed to the measurement of other designated compounds.


QASoft is written in the Array Basic programming language of GRAMS software of Informatics and Services Division, Thermo Electron Corporation. Operations are carried out through the Infrared Analysis, Inc. Workbook page, shown here.

There are two main parts to QASoft: (1) the database and (2) the operating programs. The database contains spectra of 392 compounds at resolutions of 0.5, and 1.0 cm-1. These spectra permit computation of concentrations from a sample spectrum without the need for any other calibration. In analyzing for the 392 compounds, the only chemical that the user will need to handle is his sample.

The compounds were previously listed in the discussion of our book: PROCEDURES IN INFRARED ANALYSIS OF GASES.

The analytical technique used in QASoft is called RIAS – for Region Integration and Subtraction. RIAS can succeed when other quantitative analysis methods will fail, because RIAS takes advantage of fine structure in the spectra. RIAS works when measuring narrow spectral features--spikes (Q-branches), shoulders of bands, small bundles of lines, or even individual lines. This use of sharp features allows accurate measurements on mixtures of compounds with overlapping spectra, even when there are unknown contributors to the absorption. Gases can be measured even when their spectral features are below the noise level in the spectrum.

The operating programs do the automatic quantitative analysis with two stages of automation..

Automation Stage l is the quantitative analysis for designated compounds, chosen one at a time, with interaction between operator and computer.

Automation Stage 2 is the measurement of a list of many compounds with the operator only being required to start the run and call for a print-out of the results.

Much more detail on the software is given in the discussions of the book: PROCEDURES IN INFRARED ANALYSIS OF GASES , Part 1. All of the quantitative reference spectra are printed out in Part 2 of the book.


Infrared Analysis, Inc. - Software Products - Descriptions and Prices



QASoft Version 4.0 - Program for quantitative analysis of gaseswhen working with spectra either obtained in GRAMS or imported into GRAMS, with reference spectra of 392 compounds at two

 degrees of spectral resolution: 0.5, and 1.0 cm-1. Includes book.     

Price : Send E-mail for price or catalog

GRAMS AI Version 7 - Laboratory Software by Thermo Electron - Informatics Division

Price : Send E-mail for price

QASoft Package 4.0 - Version 4.0 together with GRAMS AI Ver. 7

Price : Send E-mail for price          


QASoft 4.0 Database Only - Reference spectra of 392 compoundsat two degrees of spectral resolution : 0.5, and 1.0 cm-1. Includes book. Available in .SPC (default format) or other formats (eg. JCAMP)

Price: Send E-mail for price

Custom “Mini” Spectral Database - User’s choice of 30 compounds from the larger database. (On CD-ROM - book not included)

Price: $900.00


Upgrade from a prior version to the QASOFT 4.0 database or Programs with Database - (eligibility: must be purchased within 4 years time from the date of original purchase - no extensions of previous upgrade purchases allowed)

Price: $900.00

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