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Procedures in Infrared Analysis of Gases By Dr. Philip L. Hanst

TABLE OF CONTENTS - Click Any Topic


Absorbance law, derivation

Absorbance law, failures

Absorbance spectra

Air Pollutant concentrations and distribution

Alcohols

Aldehydes

Applications of QASoft (partial list)

Applications-Examples: Measuring Aromatics(BTEX) in Gasoline

Applications-Examples: Breath and Breathing

Applications-Examples: Explanation of the QASoft Workbook Page

Applications-Examples: Measurement of Trace Gases in Air

Array basic

Atmospheric measurements - discussion

Atmospheric measurements - examples

Automatic analysis call-up

Bistatic system

Browse, the search function of QASoft

Calibration comes from the quantitative reference spectra

Carbon dioxide interference removal

Computer operations in the sequence analysis of 13 trace gases in air

Concentration range for quantitative analysis

Cryogenic concentration

Database of gas phase infrared spectra

DIAL

DOAS

Electromagnetic spectrum, regions

Esters

Ethers

Flowing gas dilution system

Fourier transform

Frequency shifts

Fundamental infrared region

Gases and condensed phases have differing techniques of measurement

Gases and vapors

Gas measurement requires a long optical path

Gas sample handling

Gas sampling bags

Gas sampling syringes

Glass and anodized aluminum, advantages

Halogenated benzenes

Halogenated ethanes

Halogenated ethylenes

Halogenated methanes

Hardware requirements for QASoft

Heatable long path cells

High pressure problems

High temperature warning

Humidification device

Hydrides

Hydrocarbons, aromatic

Hydrocarbons, C1 through C4

Hydrocarbons, C5

Hydrocarbons, C6 and up, non-aromatic

Impurities in infrared active gases

Impurities in liquid water

Integral (in RIAS)

Integration region and zero level selection

Interference fringes

Interferogram

Interferometer

Ketones

Laser Device

Learning to use QASoft

Line shape changes with pressure reduction

Line widths and resolution requirements

Long Path Cells

Main Points

MCT Detector (Mercury-cadmium-telluride)

Micrograms per cubic meter

Minimum detection limits (MDL)

Mirror coating

Molecular signatures

Nitrogen compounds, inorganic

Nitrogen-containing organics

Nitrogen gas from liquid nitrogen

Noise in the spectrum

Non-dispersive analysis

Open path measurements

Organic acids

Oxides and peroxides

Photolysis assisted pollution analysis (PAPA)

PPM (parts-per-million)

Purging the sample compartment is not recommended

QASoft (quantitative analysis software

QASoft action buttons

QASoft uses GRAMS AI to import spectra

Quantitative accuracy of the spectra

References

Region integration and subtraction (RIAS)

Remote sensing

Room temperature work, benefits of and technique for

Rules for quantitative analysis of gases

Sampling Considerations

Sequence Analysis

Signal decrease due to the presence of the long path cell

Simplifications

Single component analysis

Specinfo

Spectral subtraction

Subtraction artifacts

Sulfur-containing compounds

Synthetic spectra creation

TDLAS

Transfer Optics

Variable-focus retroreflector

Water and CO2 interference removal

Water lines removal

White cell examples

Windows

Wrong answers are created by high absorbance values

X-Shift

Zap

Zero filling