Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) UV/vis absorption spectra (solid lines) and their second derivatives (dashed lines) in the Q-band region at different pH values. (B) UV/vis absorption as a function of pH for several wavelengths. Midpoints are indicated with arrows and were obtained from three-state fits.
