TITLE: X-ray laser diffraction and optical image data from freezing supercooled water drops AUTHORS: Armin Kalita, Maximillian Mrozek-McCourt, Thomas F. Kaldawi, Philip R. Willmott, N. Duane Loh, Sebastian Marte, Raymond G. Sierra, Hartawan Laksmono, Jason E. Koglin, Matt J. Hayes, Robert H. Paul, Serge A. H. Guillet, Andrew L. Aquila, Mengning Liang, Sébastien Boutet and Claudiu A. Stan CONTACT: Claudiu A. Stan, claudiu.stan@rutgers.edu DESCRIPTION: This data set contains selected X-ray diffraction and optical imaging data collected from freezing water microdrops. Detailed information on the experiment and on the data analysis will be given in a future publication. The paper information will be posted, when it becomes available, on the CXIDB page for the data set. Files from M025 M033 and from to R061 to R092 are for pure water drops, files from R154 to R164 are for drops doped with silver iodide, and files from R177 to R184 are for drops doped with Arizona Test Dust. The data set contains both data and auxiliary information and it is organized in the following directories: X-ray_diffraction_data\ Selected and grouped single-shot X-ray diffraction data from freezing drops. For each shot: the raw (uncorrected) output of the CSPAD 2D X-ray detector in packed format, the XFEL pulse energy at source, and the event number within the run are included. The data is grouped by the experimental run number and by an empirically defined stage of freezing (e.g. Stage 1 denotes a liquid drop prior to freezing). The data is in HDF5 (.h5) format. Example codes and auxiliary data for extracting the .h5 files are provided in the directores Data_extraction\ and Single-shot_auxiliary_data\. Optical_data_synchronized_with_XRD\ Selected and grouped high-magnification images of freezing drops. Images were processed using linear operations to improve their contrast, because the raw data was recorded with double light exposures, which reduce the optical contrast. The data is grouped by the experimental run number and by an empirically defined stage of freezing (e.g. Stage 1 denotes a liquid drop prior to freezing). The data is in AVI (.avi) movie format. These optical images were recorded simultaneously with X-ray diffraction data. The file names are identical to the ones in X-ray_diffraction_data\ except for the file extensions, and the Nth image in an .avi movie and the Nth shot in the corresponding .h5 file were recorded from the same drop. Example codes and auxiliary data for extracting the .avi files are provided in the directory Data_extraction\. Optical_data_for_statistics\ Selected and grouped high-magnification images of freezing drops (2 light exposures), and low-magnification images of freezing drops (12 exposures). The images were processed with linear operations to improve their contrast. High-magnification data is grouped by the experimental run number and by an empirically defined stage of freezing (e.g. Stage 1 denotes a liquid drop prior to freezing). Low-magnification data is grouped by the run number and the file names contain the flight distances of the drops. The flight distances for the high-magnification movies are listed in the spreadsheet Data_groups_for_statistics.xlsx. All data is in AVI (.avi) movie format. This directory contains only data from pure water drops that are suitable for statistics. The high-magnification images are a subset of the ones synchronized with diffraction data, restricted to short flight distances and to narrow depths of field. Single-shot_auxiliary_data\ Single-shot information for the experimental runs collecting both X-ray diffraction and optical images, which is needed to extract the selected data and to group it. The information is stored in MATLAB data files and includes LCLS timing variables, stage assignments, and corrections (Zcorr) for the distance between the drop and the X-ray detector. The correction is applied by adding it to the nominal sample-detector distance. The Zcorr variable is provided for all runs, but it is different from zero only for runs with a wide imaging field of view. Geometry_and_calibration\ Auxiliary information for the processing of the X-ray diffraction data, defined at each detector pixel. It contains data on detector geometry, masking, attenuation factors due to a post-sample attenuator, and the dark signal (pedestal) of the detector. The information is stored in MATLAB (.mat) data files. Shift3 files apply to runs from R061 to R092. Shift5 files apply to runs from R154 to R184. Data_extraction\ Codes and auxiliary data used to process and extract the data. Brief descriptions of the code and data files are given in the spreadsheet 00_FileDescriptions.xlsx.