What are the energy values of the electronic levels in Methane molecule?

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What is the role of the restrictors in gas chromatograph?

Hello, As you can see in the figure, restrictors are on the way of carrier gas or some time sample gas. Why do we use the restrictors in gas chromatograph systems? what is the role of this part?

08 September 2018 10,171 3 View

How do I add time dependence variable in COMSOL?

Hello I want to add a time dependence external force such as a pulse into my model in comsol. How do I add this? in general, How can I add a time dependence variable or dipole(for example) in a...

07 August 2016 761 2 View

How to use previous solution as initial value of pressure in second study in COMSOL?

Hello I am use two "Pressure Acoustics, Transient" physics (actd & actd2) and two "Time Dependent" study (sol1(for actd) & sol2(for actd2)) and in 3D I have two regions with different...

07 August 2016 7,670 6 View

What is the vibrational level n probability in thermodynamics equilibrium condition?

Hello for a diatomic gas in thermodynamics equilibrium, what is the vibrational level n probability? is below equation correct? P(vibration level n probability)=(1/Total Partition...

06 July 2016 7,340 2 View

Why don't we consider electronic level of molecule as degree of freedom such as vibration and rotation?

Hello we know a nonlinear molecule has 3N degree of freedoms. 3 are translational, 3 are rotational and 3N-6 are vibrational degree of freedoms. but The molecule has another degree of freedoms to...

06 July 2016 7,736 5 View

What is the physical reason for anode potential drop in low-pressure glow discharges?

Hello In low-pressure glow discharges, two regions which are close to electrodes have relatively stronge electrical field and potential drops occur in this two regions. What is the physical reason...

04 May 2016 2,666 7 View

How can I convert "µ" unit of pressure to Pa or mm-Hg?

Hello in some literatures pressure unit is "µ" and I want to convert it to Pa or mm-Hg. How can I do it? Thank you

04 May 2016 4,767 1 View

What happened to photons energy?

Hello Assume we have a Stern Gerlach setup which its field is directed toward z direction. A ray of Ag atoms(N atoms) comes out of oven and pass through of our setup. when atoms feel magnetic...

03 April 2016 3,024 3 View

Are there some of quantum measurements based on weak interaction?

Hi I think common quantum measurements are based on electromagnetic interaction and each measurement has at least one EM interaction. Is it true? If we can perform a quantum measurement based on...

06 July 2015 2,737 10 View

How to calculate CCS for Sodiated adduct ions and Multiply Charged Ions?

I'm currently working on calculating the collision cross section (CCS) for various ions, and I'm facing challenges when dealing with sodiated and multiply charged ions. Most of the resources I’ve...

08 August 2024 8,329 0 View

1. If I can quantize the atom using this hyperbolic spiral and classical physics, could nature do the same?

If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...

07 August 2024 5,343 2 View

How are iso-frequency contours plotted?

Let's say we have a standard, regular hexagonal honeycomb with a 3-arm primitive unit cell (something like the figure attached; the figure is only representative and not drawn to scale). The...

07 August 2024 1,937 1 View

Absorption coefficient of methane?

Hello, Can anyone provide me with the absorption coefficient of methane gas at 7.7 um? Any reference?

06 August 2024 980 5 View

Is it possible to improve the reforming section of the Haber-Bosch process without using air separation units?

A typical reforming section in a large-scale Haber-Bosch process (Figure 1) comprises two reactors. A mixture of methane (CH4) and steam (H2O) is fed into a primary reformer to produce syngas via...

01 August 2024 7,051 5 View

Best mask design for metal deposition aiming build a Perovskite solar cell device?

What types of mask designs for metal deposition, to be used in a PVD system, are best suited for perovskite-based solar cells?

31 July 2024 4,835 3 View

Inquiry on Maximum Nucleic Acid Volume for 2.5 mL Liposome Solution?

I am currently working on a project involving liposomes and need to determine the maximum volume of siRNA that can be added to a 2.5 mL liposome solution with a total lipid concentration of 10...

30 July 2024 6,420 1 View

How can I use DFT-D3 correction ( Siesta version 5.0.1)?

Dear Siesta Users, I installed Siesta 5.0.1 and I want to use Grimme's D3 correction. According to the 5.0.1 manual, I could use a few parameters to include the D3 correction in the...

27 July 2024 5,748 0 View

EDC carbodiimide and NHS easter 's half life among different pH?

It has been long known that EDC carbodiimide and NHS easter's half life agains hydrolysis are highly related to pH. However, very surprisingly, not yet found a paper giving a table/chart of their...

25 July 2024 8,738 0 View

Is the zero-zero component of the metric tensor equal to 1 for accelerating reference frames?

Consider the case of negligible gravity but there is an accelerating reference frame. Its origin traces out a trajectory, or world line, seen in some inertial reference frame. The Lorentz metric...

24 July 2024 1,608 15 View