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News

04/23/12

PQSMol 2.0 revision 3 for Mac OS X is available now. Please visit the software section to download.

04/16/12

PQS 4.0 revision 4 is available now. It is a free upgrade for 4.0 users. Please visit the software section to download.

03/13/12

Intel Sandy Bridge 8-core based QuantumCubes^TM and AMD Interlagos 12- and 16-core based QuantmCubes^TM are available now. Please visit the machines section for details.

11/14/11

Website/email disruption. On Friday 11/11/11 our 10 year domain name registration expired. As a result we were unreachable via our website or email until Monday 11/14/11. We apologize for any inconvenience.

10/26/11

PQS 4.0 revision 3 is available now. It is a free upgrade for 4.0 users. Please visit the software section to download.

09/13/11

PQS 4.0 revision 2 is available now. It is a free upgrade for 4.0 users. Please visit the software section to download.

09/09/11

PQSMol 2.0 revision 1 is now available for Linux. It is a free upgrade for 2.0 users. The Trial version does not require a license and is free to download.

SUPPORT

by phone: (CST)
M-F 9:30am - 5:00pm
1-877-759-2777 or
1-479-521-5118.

by email:
general/customer service
sales@pqs-chem.com
technical support
tech@pqs-chem.com

Documentation

Manuals and Guides

• PQS Manual (PDF)
• PQSMol Manual (PDF)
• PQS installation instructions and overview (TXT)

Tutorials

• Tutorial 1 - Orbitals and Vibrational Frequencies in Lactic Acid
  • 1.1 Building the Lactic Acid molecule
  • 1.2 Creating a PQS input file
  • 1.3 Submitting the PQS job
  • 1.4 Visualizing the PQS job output
• Tutorial 2 - VCD spectrum of CHFClBr
  • 2.1 Building CHFClBr
  • 2.2 Creating a PQS input file
  • 2.3 Submitting a PQS job
  • 2.4 Visualizing the PQS job output
• Tutorial 3 - Methoxy Substitution in Perfluoroanthracene
  • 3.1 Building Perfluoroanthracene
  • 3.2 Creating a PQS input file
  • 3.3 Submitting a PQS job
  • 3.4 Visualizing the PQS job output
  • 3.5 Building 1-Methoxy-Perfluoroanthracene
  • 3.6 Visualizing the PQS job output
  • 3.7 Building 2- and 9-Methoxy-Perfluoroanthracene and Visualizing the PQS job outputs
  • 3.8 Comparing the NMR Spectra of perfluoroanthracene, 1-, 2-, and 9-methoxy- perfluoroanthracene

Tutorial 2.4 Visualizing the PQS job output

When the job is finished, PQSMOL is automatically started in View mode with the job's output file as an argument, Figure .

Note: You can also start the job visualization via Calculation→Visualize Output menu item in the Build window
menubar.

View window - initial display

Step 10
Examine the electron density

Press the Orbitals button in the toolbar at the bottom of the view window, to open the Orbitals window, Figure . The graph on the left side of the window shows the the energy levels for the individual orbitals. The orbital list on the right contains the calculated orbitals. By default, the list and the graph are limited to displaying orbitals from an energy level of -2.5Ev and no more than the first 10 virtual orbitals. To display all calculated orbitals press the Full View button. The Default View
button toggles back the default orbital range.

In the list on the right select Elect.ron density item, as shown in Figure .

Orbitals window - electron density selected

The corresponding View window is shown in Figure .

View window - electron density displayed

Use the Isosurface level slider in the Orbitals window to change the displayed isosurface.

Step 11
Examine the IR Spectrum

Press the Vibrational Frequencies button in the toolbar at the bottom of the view window. The Vibrational Frequencies window appears, Figure , displaying the simulated IR spectrum. Select the most intensive signal in the IR spectrum by clicking on highest peak in the graph or select #5 in the Frequencies list on the right.After activating the Vectors checkbox, the atomic displacements in this mode will be displayed as yellow arrows at each atom in the structure in the View window, Figure .

Vibrational Frequencies window - most intense IR mode in CHFCLBr

The corresponding View window is shown in Figure .

Activating the Reverse checkbox will reverse the directions of the arrows. To show an animation of the vibrational mode in the View window activate the Animate
checkbox in the Vibrational Frequencies window. To view other modes either select another peak in the simulated spectrum or select another mode number in the Frequencies list.

View window - displacements in the most intense IR mode in CHFClBr

Step 12
Examine the Vibrational Circular Dichroism Spectrum

Select the VCD radio button at the bottom of the Vibrational Frequencies window. This will display the simulated VCD spectrum, Figure .

Vibrational Frequencies window - VCD spectrum, Frequency no. 5 selected

The corresponding vibrational modes can be displayed and/or animated in exactly the same way as for the simulated IR spectrum. Selecting the peak with positive rotational strength (signal pointing up) with the Vectors checkbox activated will show the corresponding atomic displacements in the View window, Figure . At the same time the frequency number will be highlighted in the Frequencies list on the right.

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