(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

First of all, this is my first post here, so I apologize if I format things incorrectly.

I'm working on a Matlab script to evaluate the tunnel ionization rates via the PPT model given the correct set of input parameters. The rate equation I am using contains equations 1-11 of A. Talebpour, et al. "Semi-empirical model for the rate of tunnel ionization..." from Opcits Communications 163, (1999) 29-32.

The paragraph leading up to the formula gives "In this model the rate of the TI from a state of an atom with ionization potential Ei, quantum numbers l and m and effective charge Zeff, in a laser field with frequency w and peak electric field F, in atomic units is given by..."

My rate calculations are giving me answers that are many orders of magnitudes off and I think its due to my use of atomic units. I know I have l,m, and Zeff in my equations correct, but I am unsure on the ionization potentials, frequencies, and electric fields in atomic units. The values I have in other units are:

w = 2.8986e+014 Hz (1035 nm wavelength)

Ei = 15.58 eV (N2)

E-field = 1.5e10 V/m

2. Relevant equations

There are way too many to type out for this formula; my main question is about atomic units. See the above-referenced paper for the actual equations.

3. The attempt at a solution

I've read about atomic units meaning that many constants (like h, hbar, etc) are identically set to 1, but I can't see how to apply this in my situation. I have found several different conversion factors online, but I can't convince myself that any of them are right.

If anyone is familiar with using atomic units in situations like this, please help!

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Tunnel ionization rates; question on atomic units

**Physics Forums | Science Articles, Homework Help, Discussion**