Excitation, emission and synchronous fluorescence spectroscopy of polycyclic aromatic hydrocarbons at cryogenic temperatures : simulation model, cryogenic instrumentation and sensitivity assessment for astrochemical applications.

This dissertation explores the absorption, excitation, emission, and synchronous fluorescence spectroscopy of polycyclic aromatic hydrocarbons (PAHs) relevant to astrochemistry at cryogenic temperatures. Main contents are organized into eight chapters. First, basic principles of absorption, fluorescence emission, excitation, and synchronous spectroscopy are discussed. The second chapter discusses the cryogenic instrumentation setup, and procedures for low-temperature measurements. In chapters three and four mathematical model for simulating synchronous spectra and its practical applications are discussed. Chapter five includes the measurement and analysis of absorption, emission, excitation, and synchronous spectra of PAHs in hexane or water solutions at cryogenic temperatures. Chapter six contains the sensitivity assessment. Chapter seven discusses the infrared bands of formaldehyde dissolved in liquid krypton at cryogenic temperatures. Research outlook is presented in chapter eight. The main conclusion is that synchronous fluorescence spectroscopy can be successfully applied as an analytical tool for analyzing organic compounds of astrochemical origins.