Image Rotation Molybdenum Trioxide Crystals

51-1625-1408

A test specimen with molybdenum trioxide crystals on a carbon film is good for the calibration of the image-diffraction rotation angle in TEM and STEM mode. Molybdenum trioxide is pseudo-orthorhombic (lattice parameters a 0.397nm, b 1.385nm and c 0.370nm). From a double-exposure, or the overlaying of an image and diffraction pattern, the rotation angle can be established.

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DESCRIPTION

Diffraction pattern ring diameters can be simply related to the lattice plane spacings in the crystal used as the specimen. For a lattice spacing d, in a microscope of effective camera length L and operating at an accelerating voltage corresponding to a wavelength l, the diffraction ring diameter is r where lL = dr It is not easy to measure the actual value of L or know the precise value of accelerating voltage. However, without knowing the exact values of l and L, one can determine an unknown lattice spacing by measurement of r, if the instrument has first been calibrated with a known substance. This can best be done by using a polycrystalline material of known lattice spacings, so that continuous diffraction rings are available for measurement. The ring diameters must all be measured in the same plane relative to the microscope (to avoid any errors due to ellipticity of the pattern). Furthermore, the calibrating ring diameter chosen should be similar to that required to be calibrated since there may be distortion of the relative ring diameters due to residual barrel or pincushion distortion in the projector lens system.

Molybdenum Trioxide Crystals are most useful to determine the rotation between a diffraction pattern and the
selected area image. Select a thin crystal not overlaid by others, so that a clear Laue diffraction pattern is obtained. Starting from the diffraction pattern, change the strength of the diffraction lens until each diffraction spot shows a small image of the crystal. It will be possible to determine the sense of the rotation of the image as the magnification is increased. Check whether there is an image inversion between the diffraction position and the selected area magnification. The actual magnitude of the rotation angle between the crystal and its pattern can be determined by recording both image and diffraction pattern on a single plate. The correct rotation angle between pattern and image can then be determined by taking into account the sense of rotation and any image inversion

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Our eStore allows customers to pay for their order by prepaid methods like debit & credit card, paypal or prepaid invoice via a bank transfer and through postpaid net 30 days invoice. If you wish to pay by card or paypal, you don’t need to communicate with us first and you can also check out as guest. If you wish to pay by prepaid bank transfer, you will have to register a MyOI account first, then request to ecommerceteam@estore.oxinst.com to activate prepaid bank transfer (Proforma invoice) on your MyOI account.

If you wish to pay by net 30 days invoice, you will have to request this when you register a MyOI account. Please be aware that only customers with previous business with Oxford Instruments will be authorised to pay by net 30 day invoice. You can explain your previous business with Oxford Instruments when you register your MyOI account. If your institution or company doesn’t have any previous business relationship with Oxford Instruments, you will be asked to place at least 3 prepaid orders through the eStore before we can consider your request.

If your institution or company has a special arrangement with Oxford Instruments, please get in touch with ecommerceteam@estore.oxinst.com providing information about your contact person in Oxford Instruments

Our eStore is managed by our ecommerce partner ModusLink. This means that on the e-invoice, you will see both the ModusLink and Oxford Instruments logos. If you wish to pay by net 30 day invoice, you will have to send us a PO with ModusLink as supplier, because the invoice will have to be paid into ModusLink’s bank account, so we need to make sure ModusLink is a registered vendor in your system and payment won’t be delayed.

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