1. A student prepares a sample and collects a powder diffraction pattern on an in- strument that is available in the laboratory overseen by his major professor. The student then takes the same sample to a different laboratory on campus and col- lects a second set of powder diffraction data. When he comes back to his office, he plots both patterns. The result is shown in Fig. 7.13. Analyze possible sources of the observed differences. 500 400 300 200 بعدیسیفا 100 بعسيدل 25 30 35 40 45 Bragg angle, 20 (deg.) Fig. 7.13 Two powder diffraction patterns collected by a student using the same sample but two lifferent powder diffractometers. Intensity, Y (arb. units)

1. A student prepares a sample and collects a powder diffraction pattern on an in- strument that is available in the laboratory overseen by his major professor. The student then takes the same sample to a different laboratory on campus and col- lects a second set of powder diffraction data. When he comes back to his office, he plots both patterns. The result is shown in Fig. 7.13. Analyze possible sources of the observed differences. 500 400 300 200 بعدیسیفا 100 بعسيدل 25 30 35 40 45 Bragg angle, 20 (deg.) Fig. 7.13 Two powder diffraction patterns collected by a student using the same sample but two lifferent powder diffractometers. Intensity, Y (arb. units)