Multiple time scales in diffraction measurements of diffusive surface relaxation.
We grew SrTiO3 on SrTiO3(001) by pulsed laser deposition, using x-ray scattering to monitor the growth in real time. The time-resolved small-angle scattering exhibits a well-defined length scale associated with the spacing between unit-cell high surface features. This length scale imposes a discrete spectrum of Fourier components and rate constants upon the diffusion equation solution, evident in multiple exponential relaxation of the "anti-Bragg" diffracted intensity. An Arrhenius analysis of measured rate constants confirms that they originate from a single activation energy.
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
Aaron
A
Fleet
Darren
D
Dale
A R
AR
Woll
Y
Y
Suzuki
J D
JD
Brock
D005583:Fourier Analysis; D007834:Lasers; D018625:Microscopy, Atomic Force; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D010087:Oxides; D014025:Titanium; C119252:strontium titanium oxide; D013324:Strontium