Optical Absorption and Magnetic Field Effect Based Imaging of Transient Radicals

Abstract

Figure 4. a) Simplified reaction scheme for FAD photoexcitation at pH 2.3. b) Reduction of the MFE on RP/PTS concentration with increasing pump light pulse length. c) Singlet excited state FAD fluorescence detected MARY curve under high power CW pump light modulation,revealing an inverse MFE on the FAD GS concentration.

Large Magneto-Current Effect in the Electrochemical Detection of Oxalate in Aqueous Solution

“…Magnetic fields can alter the rate, yield, or product distribution of chemical reactions, which is known as spin chemistry. − At present, the study of magnetic field effects in electrochemical reactions is one of the most interesting problems of spin chemistry. − This develops a new paradigm: spin-dependent electrochemistry. The experimental implementation of spin-dependent electrochemistry was first described in a 2013 paper .…”

Cellular autofluorescence is magnetic field sensitive

“…In recent years, to address this problem and to directly investigate MFEs of RPs in biological systems, some research groups, including ours, have developed a number of microscope-based imaging approaches [transient absorption (TA) based (15,16) and fluorescence based (17)]. Some of our recent experiments have demonstrated that the photochemistry of FAD in aqueous solution is magnetic field sensitive, even at physiological pH, using our TA-based microscope (18).…”

Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects

“…20 There are other, related, techniques which make use of the field-modulation and derivative detection. In recent years, field-modulation technique has been combined with laser scanning to yield both fluorescence 21 and absorptionbased ModMARY imaging 22,23 (referred to as magnetofluorescence imaging (MFI) and magnetic intensity modulation (MIM) imaging respectively). The general technique of stimulus-modulation can be seen in many fields of spectroscopy, most notably optical spectroscopy, for example in frequency (wavelength) modulation using tunable light sources, cavity spectroscopy and electron paramagnetic resonance (EPR).…”