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.
Logarithmic plots of intensity and excitation power at the objective indicating three-photon excitation. A first order polynomial fit is applied to a log-log plot of the data, as shown by the solid curves. The results for using heavy water (D2O) and regular water (H2O) as the immersion medium are indicted by blue and red data points, respectively.
