University of Alaska Fairbanks
This site provides quick access to the
Gaussian, ORCA, and
MOPAC quantum mechanics programs via WebMO, a graphical web-based
interface used by chemists to construct molecular models, carry out
quantum calculations, and view calculation results.
Student logins to the UAF WebMO site:
First, click the graphic in the top-right of this page to open the "WebMO Login" page. (Optional: If you're having trouble logging in, drag the tab for the login page onto your desktop so that you can now see two pages: this page and the login page.)
Then, on the login page:
Enter your UA username (jsomebody, rather than firstname.lastname@example.org) and password. Click the login button. If the page is slow to load, click the login button a second time. Now, using the drop-down menu, choose a group that has been defined for your class, and enter the group password. Subsequent logins will not require choosing a group.
Having trouble logging in? Here is a
(no audio) showing how a student logs in to a class, does a short job, logs out, and
logs back in.
Other WebMO users:
If you are not using this site for a chemistry class, you may still log in. In this case, enter your UA username and password, and select the General group using the drop-down menu. Leave the password box empty.
Enter a dedicated username and password assigned by your instructor or the system administrator.
Alternate WebMO servers. If for some reason the UAF chem dept
WebMO servers are down or unreachable, the following sites can be used:
How to log on and carry out geometry
optimization and frequency calculations on the H2O molecule.
Only a browser (Chrome, Firefox, or other) is required. Click the WebMO icon at the top-right of this page to go to the logon page. Login with your username and password (see above).
Click the New Job tab, Create New Job. Draw a small molecule like H2O as follows: click the red Build icon that looks like a water molecule, which is topmost on the left-hand toolbar. Touch the letter O on your keyboard, then left-click in the workspace. Now do Clean-Up, Comprehensive-Idealized (or click the "broom icon" in the left toolbar). Click the > arrow at the bottom right. On the Choose Computation Engine page choose Gaussian, Select Server, First Available, and click the > arrow. In the Calculation box, choose Optimize + Vib Freq; choose theory, B3LYP (the default), 6-31G(d,p) basis set, Charge = 0, and Singlet multiplicity. Submit the job by clicking the > arrow at the bottom right. The Job Manager should first say Queued, then Running, then after a few seconds, Complete.
To see the results, click the magnifying glass icon. To animate a vibration, scroll down to the Vibrational Modes table near the bottom of the View Job page, click the "animate" icon of whichever vibration you wish to see. To stop the animation, click the "Reset Viewer" button at the bottom of the molecule workspace.
detailed WebMO How-To webpage. This shows
screen shots of setting up a optimization and frequency calculation (in
Gaussian) for protonated methylamine
using a standard ab initio method (B3LYP/6-31G(d,p)).
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The UAF Dept of Chemistry and Biochemistry serves Alaska and the Nation through research and scholarship in chemistry, and in the environmental and biomedical sciences.