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光栅未能严格垂直于入射光放置时将形成误差.光栅放置成其法线与入射光方向的夹角为衍射角的一半时,衍射角为最小值.在最小衍射角的位置上完成光栅衍射实验,可以消去在光栅垂直放置时的1、2阶误差,此外还观察到对实验有利的现象:衍射明纹光强增大和级次增多. 相似文献
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测量偏转角的一类实验包括光束或电子束的偏转、检流计指针或光点的偏转、扭秤的偏转等普通物理和近代物理实验.这些实验中,当被测量符号相反时指示装置如能反向偏转,就可以运用对称偏转法(简称对称法)测量. 相似文献
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偏转角测量中对称法的应用华南建设学院(东院)梁礼正测量偏转角的一类实验包括光束或电子束的偏转、检流计指针或光点的偏转、扭秤的偏转等普通物理和近代物理实验.这些实验中,当被测量符号相反时指示装置如能反向偏转,就可以运用对称偏转法(简称对称法)测量.对称... 相似文献
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很多物理实验课本讲到测量圆柱体和球的体积,都是在测量直径和圆柱体的高时在不同部位进行多次测量,计算多次测量值的平均值和标准误差,进而计算其体积和误差。我认为,任意地进行多次测量以及用多次测量值的标准误差作为直径或高的误差是欠妥的。其一,多次测量值之间稍有不同是圆柱体的圆度的误差和两底面的不严格平行,或球的圆度的误差造成的。如果在等间隔的不同部位进行多次测量,则并非测 相似文献
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THE RAMAN SCATTERING OF CARBON NANOTUBES PRODUCED IN DIFFERENT INERT GASES AND THEIR PRESSURES BY ARC DISCHARGE 下载免费PDF全文
First- and second-order Raman spectra of carbon nanotubes produced in helium and argon atmospheres at a pressure ranging from 11 to 92 kPa by arc discharge have been measured and compared with each other. The position and bandwidth of the spectral lines depend on the kind of inert gases and their pressure. The Raman spectra of the nanotubes produced in argon gas atmosphere are much more similar to that of polycrystalline graphite than those of the nanotubes produced in helium gas atmosphere. The position and bandwidth of nanotube Raman peaks change with gas pressure in arc discharge because different diameter distribution of nanotubes is produced at different inert gas pressure. The Raman spectra of nanotubes produced at high pressure is much more like that of graphite than those produced in lower pressure 相似文献
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