animated-400-RHEED

The kSA 400 combines a high-resolution, high-speed, and high-sensitivity CCD camera with sophisticated RHEED-specific acquisition and analysis software. This flexible system enables the analysis of virtually any image feature and, with one of many additional options, controls the electron gun for such tasks as acquiring RHEED rocking curves.

Easy to use and straightforward to install, the kSA 400 is designed for convenience and gives quantitative results right out of the box. Seamless integration between hardware and software as well as visually-driven RHEED pattern analysis, makes user operation straightforward and simple. Extensive customer input has helped us make the kSA 400 the industry’s most powerful analytical RHEED system and an integral part of MBE, PLD, PVD, and surface science chambers worldwide. Now in its fifth generation, the goal of the kSA 400 is to provide you with the most information from your RHEED pattern.

For more information see the Product Specification Sheet →

Growth Rate

The most common use of RHEED is for determining growth rate via RHEED intensity oscillations, a phenomena that occurs during layer-by-layer epitaxial growth. The kSA 400 determines growth rate via three complimentary methods: Fourier-transform, extrema count (derivative analysis), and damped sine wave fitting. These three techniques determine growth rate independently, resulting in very accurate and consistent measurement of your thin-film growth rate. Watch the kSA 400 monitor RHEED oscillations.

kSA 400

The kSA 400 is the most advanced, full featured RHEED data acquisition and analysis package available. With a long list of capabilities, and available plug-in options, the kSA 400 offers the most insight from RHEED patterns. Click here for list of the kSA 400 software features.

kSA 400 Lite

A RHEED acquisition and analysis package for those requiring only basic image capture and data analysis. The kSA 400 Lite package can be upgraded to the full featured version of kSA 400 at any time.  Click here for a table detailing kSA 400 vs kSA 400 Lite software functionality.

kSA 400 AOS

An Analysis Only version designed for users who want to perform post-acquisition display, processing, and analysis away from the laboratory. The analysis software license is available to users that currently own a full kSA 400 system.

What You Get With a kSA 400 System

  • High resolution, high S/N camera
  • Optic Mounts for mounting to the RHEED screen viewport
  • Appropriate cabling
  • kSA 400 or kSA 400 Lite software (compatible with Win XP, Win 7 32-bit, and Win 7 64-bit)
  • kSA 400 RHEED Image Library (full version of kSA 400 only)
  • Computer (optional)

The kSA 400 supports several plug-in options to give you even more analytical capability. These plug-ins include:

These options can be added to a standard kSA 400 system at any time, and typically include a software plug-in and hardware additions. One of our most popular plug-in options is RHEED Electron Gun Control, which allows you to control all the settings of your RHEED gun through the kSA 400 software. The kSA 400 software also allows you to acquire RHEED images while varying gun control parameters e.g. beam rocking acquisition which is supported on Staib beam rocking electron guns.

Figure 2: Partial folder list of kSA 400 RIL.

Figure 1: Partial folder list of kSA 400 RIL.

The kSA 400 RHEED Image Library (RIL) is a compilation of images and movies acquired from our kSA 400 customers, to the tune of ~ 30 gbytes of data. We have asked our customers to document the details of the conditions under which the data was taken, e.g. what the growth conditions are (temperature substrate, etc.), what the crystal orientation is, what the beam energy is, and so on. These details are either in the file name or in the Comments section of the file

We envision the use of the RIL to be mainly as a reference library for RHEED. Here are some examples of how we envision the RIL being used:

  • You’re curious about what the oxide desorption process looks like for a GaAs substrate, so you load a GaAs desorb movie from the RIL and watch the evolution of the RHEED pattern as the oxide desorption occurs.
  • You are working with SrTiO3 substrates, and you’d like to compare your RHEED patterns to those other researchers in your field are checking, for example, the width and length of the diffraction streaks as an indication of surface quality.
  • You are teaching a surface science class and are on the topic of RHEED, and you’d like the students to check the ratio of lattice spacings along different crystal directions to verify the bcc structure of a material. You have the students pull up a GaAs movie, identify the major pull crystal directions (rotating substrate movie), and have them check the ratios of pixel spacings.
  • You’d like to see what the growth of Ge quantum dots on Si looks like via RHEED.
  • You’d like to look at GaAs on GaAs RHEED oscillations, and test our growth rate algorithms (we have 3 different algorithms in the kSA 400) on this movie data.
ril reprocessing data files

Figure 2: Reprocessing of RIL data file (GaAs [110] growth 590C 1mls.imm) using Scan Mode Acquisition mode in the kSA 400. Very clean RHEED oscillations from all streaks except the specular streak are seen in this GaAs homoepitaxial growth.