Modern Spectroscopic Techniques for Trace Detection

Dear Colleagues,

Development and applications of advanced spectroscopic techniques have become a hot topic in recent years. With the emergence of the novel light sources from ultraviolet to the far-infrared region, such as quantum cascade lasers, interband cascade lasers, diode lasers, light emitting diodes, optical frequency combs, supercontinuum sources and so on, modern spectroscopy (for example, cavity ring down/enhanced spectroscopy, frequency/wavelength modulation spectroscopy, photoacoustic spectroscopy, and frequency comb/dual comb spectroscopy) have realized selective, interference-free, and real-time measurements with high sensitivities of sub-ppbv (10^-9) levels and fast time responses down to a few microseconds (µs). These sensitive and real-time/time-resolved spectroscopic techniques can be applied to measure trace gases, atmospheric aerosols, isotopologues and free radicals, so as to study high-resolution molecule spectroscopy, vertical atmospheric profiles, atmospheric chemistry, chemical reaction dynamics, flux or eddy covariances, breath analysis and other open scientific questions. The existing spectroscopic techniques have obtained remarkable achievements in both instrument development and applications, but they still face unresolved issues. Nevertheless, higher sensitivity, better temporal resolution, longer stability, and long-term reproducibility, as well as novel methods and new attractive application areas, are the permanent challenges for the development of spectroscopic techniques.

In this Special Issue, we focus on the recent progress in the development of advanced spectroscopy techniques and their applications. Our goal is to report and summarize the latest research and developments in the updated theory, better measurement, and new applications for existing or new spectroscopic techniques.

We are looking forward to your contributions (reviews as well as original research papers).

Dr. Hongming Yi
Dr. Amir Khodabakhsh
Guest Editors

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