Ulrich Platt is former Director of the Institute of Environmental Physics and Professor emeritus at the Ruprecht-Karls-Universität Heidelberg, Germany. He is External Scientific Member of the Max-Planck Society. Together with Dieter Perner, he introduced the idea of Differential Optical Absorption Spectroscopy (DOAS) for which he won the Robert-Wichard-Pohl-Preis 2010 of the Deutsche Physikalische Gesellschaft (German Physics Society, DPG). He published more than 200 peer-reviewed publications and wrote and edited a number of books.Jochen Stutz is Professor in the Department of Atmospheric and Oceanic Sciences at the University of California Los Angeles. His group works on the development of spectroscopic remote sensing instruments to measure atmospheric trace gases and its application to study atmospheric chemistry. He has published over 130 peer-reviewed publications. In recent years, his group has worked on improving long-path DOAS instruments for the measurement of BTEX compounds with the goal of further establishing this method as an accurate monitoring tool for refineries and air quality regulators.

• Introduction.- Atmospheric Chemistry.- Interaction of Molecules With Radiation.- Radiation Transport in the Atmosphere.- Measurement Techniques for Atmospheric Trace Gas Concentrations and Other Parameters.- Differential Absorption Spectroscopy.- The Design of Doas Instruments.- Evaluation of Doas Spectra, Sensitivity, and Detection Limits 259.- Scattered-Light Doas Measurements.- Sample Applications of “Active” Doas With Artificial Light Sources.- Sample Application of "Passive" Doas.- Doas: Yesterday, Today, and Tomorrow.

Ulrich Platt is former Director of the Institute of Environmental Physics and Professor emeritus at the Ruprecht-Karls-Universität Heidelberg, Germany. He is External Scientific Member of the Max-Planck Society. Together with Dieter Perner, he introduced the idea of Differential Optical Absorption Spectroscopy (DOAS) for which he won the Robert-Wichard-Pohl-Preis 2010 of the Deutsche Physikalische Gesellschaft (German Physics Society, DPG). He published more than 200 peer-reviewed publications and wrote and edited a number of books.Jochen Stutz is Professor in the Department of Atmospheric and Oceanic Sciences at the University of California Los Angeles. His group works on the development of spectroscopic remote sensing instruments to measure atmospheric trace gases and its application to study atmospheric chemistry. He has published over 130 peer-reviewed publications. In recent years, his group has worked on improving long-path DOAS instruments for the measurement of BTEX compounds with the goal of further establishing this method as an accurate monitoring tool for refineries and air quality regulators.

• Introduction.- Atmospheric Chemistry.- Interaction of Molecules With Radiation.- Radiation Transport in the Atmosphere.- Measurement Techniques for Atmospheric Trace Gas Concentrations and Other Parameters.- Differential Absorption Spectroscopy.- The Design of Doas Instruments.- Evaluation of Doas Spectra, Sensitivity, and Detection Limits 259.- Scattered-Light Doas Measurements.- Sample Applications of “Active” Doas With Artificial Light Sources.- Sample Application of "Passive" Doas.- Doas: Yesterday, Today, and Tomorrow.

Ulrich Platt is former Director of the Institute of Environmental Physics and Professor emeritus at the Ruprecht-Karls-Universität Heidelberg, Germany. He is External Scientific Member of the Max-Planck Society. Together with Dieter Perner, he introduced the idea of Differential Optical Absorption Spectroscopy (DOAS) for which he won the Robert-Wichard-Pohl-Preis 2010 of the Deutsche Physikalische Gesellschaft (German Physics Society, DPG). He published more than 200 peer-reviewed publications and wrote and edited a number of books.Jochen Stutz is Professor in the Department of Atmospheric and Oceanic Sciences at the University of California Los Angeles. His group works on the development of spectroscopic remote sensing instruments to measure atmospheric trace gases and its application to study atmospheric chemistry. He has published over 130 peer-reviewed publications. In recent years, his group has worked on improving long-path DOAS instruments for the measurement of BTEX compounds with the goal of further establishing this method as an accurate monitoring tool for refineries and air quality regulators.

• Introduction.- Atmospheric Chemistry.- Interaction of Molecules With Radiation.- Radiation Transport in the Atmosphere.- Measurement Techniques for Atmospheric Trace Gas Concentrations and Other Parameters.- Differential Absorption Spectroscopy.- The Design of Doas Instruments.- Evaluation of Doas Spectra, Sensitivity, and Detection Limits 259.- Scattered-Light Doas Measurements.- Sample Applications of “Active” Doas With Artificial Light Sources.- Sample Application of "Passive" Doas.- Doas: Yesterday, Today, and Tomorrow.