at the rate of 24-200 mass units in 0.13 second, resolution is poor and signal clipping is excessive.The illustrated mass spectra were obtained with an instrument equipped with an electron multiplier so that limitations imposed by time constants were primarily in the recording galvanometers. Frequency response of 1000-2000 c.p.s. is satisfactory for mass spectral scans to 300 mass units at resolution of 300-400. If an electron
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