Absorption spectroscopic studies Archaeal Proteins 1 Archaerhodopsin 3 1 Archon2 1 Article 1 Fluorescence 1 Fluorescence Resonance Energy Transfer 1 Fluorescent Dyes 1 Genetically encoded voltage sensor (GEVI) 1 Halorubrum 1 Halorubrum sodomense 1 Isomerism 1 Photochemical Processes 1 Photocycle dynamics 1 Photoisomerization 1 Protons 1 Retinaldehyde 1 Schiff Bases 1 Schiff base 1 Thermal activated isomerization, Thermal activated deprotonation 1 Thermal activated re-protonation 1 absorption 1 archaeal protein 1 archaerhodopsin 3 1 archaerhodopsin protein, Archaea 1 archon 2 1 binding protein 1 chemistry 1 controlled study 1 deprotonation 1