Light is the essential source of information about the surrounding world
for most of us. We see objects of di?erent brightness and colours, or,
in scienti?c terms, we distinguish objects by the way they re?ect light
of di?erent wa- lengths with varying e?ciency. It was exciting for both
of us to learn that scienti?c instruments can expand our senses and
provide information from this very same radiation that goes far beyond
the simple recognition of - jects.
Theabilityto"see"thecompositionoftheairsurroundingusandabove our heads,
to us and others, one of the most fascinating aspects of the app- cation
of modern technology to study the atmosphere. This fascination drove
many of the applications of the Di?erential Optical Absorption
Spectroscopy (DOAS) method presented in this book, and continues to be
the motivation for many current developments. DOAS is an elegant and
powerful analytical method to study the at- sphere and is based on the
relatively simple principles of classical absorption spectroscopy. It
has therefore always been quite surprising to us that this method has
not found wider use in atmospheric research and air-quality m- itoring.
We have introduced many university students and researchers to DOAS,
often wishing that we could improve our e?orts with a comprehensive text
that describes both the theoretical basis and the practical applications
of the method.