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Isolated Eu ^ 2 + in cubic crystal field splitting in the ground state energy level

000000I Lou College Physics Volume 22,[link widoczny dla zalogowanych], repeated measurements by averaging to reduce F, h the measurement error. The surface tension coefficient as shown in Table 2 at the same time ... at 20 ℃ measured ethanol, glycerol (contact gas is air) Table 2 ethanol, glycerol (contact gas is air), the surface tension coefficient data samples w / (10 a 'N ) F / (10 a 'm) / (10 a' m) mouth / (10 a 'N · m) / (10 a' N · m a) relative error with the standard value of ethanol 0.7212.6841.91222. 2522.30.2% glycerol 0.7066.1642.76563.0063.40.6% in the same conditions, with a few drop method,[link widoczny dla zalogowanych], pull off method and capillary surface tension of water measured coefficients were: number of liquid drop method port: (76.7 ± 3.9) × 10. N / m Port pull-off method: (70.9 ± 1.4) × 10. N / m capillary port = (71.8 ± 0.4) × 10. N / m by comparing the known, the maximum number of errors drop method, pull off big error method, capillary method error measured small but the observation of surface tension is not intuitive. The use of Note 5 Experiment 1) experiment using the liquid must be pure, can not contain impurities,[link widoczny dla zalogowanych], otherwise it will affect the measurement results. 2) The experimental equipment is clean and a greater impact on our results. To this end, the cleaning solution before the experiment to use a beaker of sodium hydroxide, wire frame,[link widoczny dla zalogowanych], and forceps,[link widoczny dla zalogowanych], and then washed with pure water, then alcohol lamp drying, and clamp the clamp wires hanging in the electronics box in the wood pan bracket hook, the experiment can not touch equipment.