Both CsI and polyethylene are transparent throughout the spectral range of this instrument.Ĥ. Be sure to choose a window material that will allow you to obtain spectral information in the region of interest. Note that your the window material may be IR-opaque in some wavelength region(s). To obtain an IR spectrum, you will have to either prepare a KBr-pellet (prepare the sample in the lab upstairs or in the hood in YH1033), a Nujol mull between CsI-plates or put your neat sample between IR plates if it is a liquid. If this doesn't happen, please inform the person in charge about the problem.ģ. strong enough to potentially interfere with the analysis of your sample), run it again to see if these peaks get smaller. If the bands have significant intensity (i.e. The spectrum should show weak bands from water vapor (3000-3500 cm -1, 1600≡750 cm -1 and below 400 cm -1) and CO 2 (twinned peak around 2350 cm -1). Obtain a background IR spectrum by clicking the icon B in the upper left corner of the screen. Allow the sample compartment to purge for some time. Make sure that the lid of the sample compartment is closed. It can be changed to absorbance units by clicking the mouse.īackground spectrum. The bottom half of the window is for selecting the vertical axis (%T is default). In the measurement program, go to Measurement-Parameter-Standard. You can choose whether your spectra are plotted with the y-axis as absorbance or as % transmittance (%T). The resolution is set to 4 cm -1 as default. The menu pops up with scan times: 16 (default). In measurement program: go to Measure-Parameters-Standard. To change the range, go to Settings-measurement range. For most of the applications, the suitable range is thus 400 to 4000 cm -1. Note that unless the instrument purge is quite rigorous, there will be considerable spectral interference from water vapor below 400 cm -1. A better resolution usually leads to very noisy spectra under those conditions. This will be good enough for most standard measurements. The preset parameters are 16 scans with 4 cm -1 resolution and a measurement range of 250≤000 cm -1. Go to ( Measure-parameter) and read in the default file (default.pr). You will first have to use the spectra measurement program. Start the spectra manager from the desktop screen on the computer. NOTE: PLEASE DO NOT OVERWRITE THE DEFAULT FILE SETTINGS! Make sure that the IR spectrometer has been turned on. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It allows the website owner to implement or change the website's content in real-time. This cookie is used by the website's WordPress theme. It works only in coordination with the primary cookie. Records the default button state of the corresponding category & the status of CCPA. The cookies is used to store the user consent for the cookies in the category "Necessary". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly.
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