Is it possible that electron transitions from a high energy state to a low energy state are caused by the electrons interacting with some other partilces in the space around atoms.Let's look at the case of a hydrogen atom: According to Niels Bohr, for an electron, r = n^2 h^2 / (8 pi x epsilonx me^2) and Energy = - E / n^2 So in Bohr's model an electron with a greater energy (an electron that has undergone a transition) has a greater value of orbital radius. The de broglie wavelength of the electron is given by lambda = h/mv and is about 10^-11 metres.This a length we can associate with the electron. So if we square the de Broglie wavelength we get an area we can associate with the electron and this is 10^-22 square metres. Now, space is filled with dark energy, at a density of 10^-27 kg per cubic metre.If the area of our electron was facing 1m^2 of dark energy this would be 10^-22 x 10^-27 = 10^-49 kg of the mass of the total mass of dark energy in a cubic metre.Nobody knows what dark energy really is but let's suppose that like anything else in the universe that has energy it consists of particles of some sort.These particles must move close to the speed of light because dark energy is considered by experts to be more energy-like than mass-like. At the speed of light,10^8 m/s, 10^49 kg of dark energy particles could strike an area equal to the de Broglie wavelength squared in 10^-8 seconds. Thus is the maximum force the dark energy particles can exert on the area (assuming the dark energy particles are all repelled by the coulomb charge) is F = m x change of velocity/ time = 10^-49 x 10^8/10^-8 = 10^-33 Newtons.The acceleration this would produce on an electron of mass 10^-31 kg is acceleration = Force/mass = 10^-2 m/s^2. A transition from n = 2 to n= 1 in the Bohr model of hydrogen amounts to a distance of about 10^-10 m.An acceleration of 10^-2 m/s^2 acting on an electron would thus move it back to the ground state in a minimum time of 10^-8 seconds.This is what is observed.Can anyone come up with a quantum mechanical calculation that could give some more convincing evidence for dark energy causing an electronic transition from an excited to a ground state.