“…To further investigate the spatiotemporal evolution of organic compounds formed during the MTO conversion, the high-resolution structured illumination microscopy (SIM) was also employed. Following the previous research results 17 , 47 – 51 , the characteristic UV-vis signals of benzene- (B + ) and naphthalene-based (N + ) carbenium ions should appear at about 390 and 480 nm, respectively, and those of phenanthrene- (PH + ) and pyrene-based (PYR + ) carbenium ions appear at ~560 and ~640 nm, respectively. Thereupon, distinguishable emission wavelengths in the range of 480–490, 500–520, 620–630, and 670–700 nm are expected for the aforementioned carbenium ions, respectively.…”