Laboratory
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"Calculate energy" is the key function of this webpage. Clicking on this button, you start the quantum chemical calculation for the structure that you have chosen above.
If you click on "reset structure" you get back to the initial state, in case you don't see any atoms anymore. Clicking on "Enter distances" allows you to put in different values for the distance between the atoms. "Calculate results" is deactivated initially... After having calculated some values yourself, you can use the button to get some recalculated values.
Here you can find the the tutorial on how to choose and calculate different structures.
If you click on "reset structure" you get back to the initial state, in case you don't see any atoms anymore. Clicking on "Enter distances" allows you to put in different values for the distance between the atoms. "Calculate results" is deactivated initially... After having calculated some values yourself, you can use the button to get some recalculated values.
Here you can find the the tutorial on how to choose and calculate different structures.
system
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These two settings ensure that you can only move the middle atom. This makes the task much easier! Of course, you can experiment without these restrictions later on!
Hier findest du das Tutorial zu dreiatomigen Systemen.
Hier findest du das Tutorial zu dreiatomigen Systemen.
The results of the quantum chemical calculation are presented here. The resulting value gives important information on the reaction, that is happening.
For the ones, that want to know more: The modulus is the difference between the total energy of the calculations below ant the energy of the separate atoms.
For the ones, that want to know more: The modulus is the difference between the total energy of the calculations below ant the energy of the separate atoms.
| Energy: |
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Here your results get animated. Looking at the structure and the graph both at the same time, should make it easier to understand the reaction. However, this only makes sense, if you have already calculated some energy values...
Atom tauschen: |
| Atom tauschen: |
Evaluation
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The graph displays the energy depending on the chosen distance between the atoms. Click on the points in the graph to be shown the corresponding structure. You can also zoom into the graph. Click on the home button on the top right corner to get back to the default view.
Here you can find the tutorial on the graph and its handling.
Here you can find the tutorial on the graph and its handling.
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Wenn du drei veränderliche Größen (z.B. zwei Abstände und eine Energie) hast, benötigst du zur Ansicht auch drei Dimensionen. Du kannst den 3D-Graphen drehen und zoomen, das "Haus"-Symbol bringt dich zurück zur Anfangsansicht. Setze den Haken, um den 3D-Graphen zu sehen.
Tipp: Wenn du Probleme mit der Orientierung im 3D-Graphen hast, vergleiche zunächst die Ansicht im 2D und 3D-Graphen für einen einfachen Fall.
Hier findest du das Tutorial zu dreiatomigen Systemen.
Tipp: Wenn du Probleme mit der Orientierung im 3D-Graphen hast, vergleiche zunächst die Ansicht im 2D und 3D-Graphen für einen einfachen Fall.
Hier findest du das Tutorial zu dreiatomigen Systemen.
In the table below you can see all the values that have already been calculated. Click at the top of the column to organize the table (e.g. from highest to lowest energy or distance)
Here you can find the tutorial on the table and its handling.
Here you can find the tutorial on the table and its handling.
In the box above you can see the output-file of the quantum chemical calculation. There, a lot of important information about the procedure of the calculation are presented - in case you want to know more about it, please go to the FAQs.
ORCA - Output
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So wird die hier angezeigte relative Energie berechnet:
Dabei setzt sich die absolute Energie aus der potentiellen un kinetischen Energie des Systems zusammen:
In der folgenden Tabelle ist erkennbar welcher Anteil der Energie nur von den Atomkernen (durch Abstoßung dieser untereinander) und welcher von den Elektronen bzw. deren Wechselwirkung.
Hier kannst du mehr darüber lernen, wie die absolute Energie für die Struktur berechnet wird und wie aus dieser die relative Energie berechnet wird, die angezeigt wird.
So wird die hier angezeigte relative Energie berechnet:
Dabei setzt sich die absolute Energie aus der potentiellen un kinetischen Energie des Systems zusammen:
| Potentielle Energie: | |
| Kinetische Energie: |
| Abstoßung der Atomkerne: | |
| Energie der Elektronen : | |
| kinetische Energie + Anziehung zu Kernen: |
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| Abstoßung zwischen Elektronen: |