
TL;DR
This paper demonstrates that charging effects significantly enhance the survival of solid hydrogen grains in the diffuse interstellar medium by suppressing sublimation, suggesting they could persist indefinitely and be detectable through spectral signatures.
Contribution
It reveals the critical role of electrostatic charging in stabilizing hydrogen dust grains, a factor previously overlooked in sublimation models.
Findings
Charging reduces hydrogen grain sublimation rates.
Hydrogen grains can survive indefinitely in the diffuse ISM.
Potential spectral signatures of H2 grains could be detectable.
Abstract
We consider the survival of solid H2 in the diffuse interstellar medium, with application to grains which are small enough to qualify as dust. Consideration of only the thermal aspects of this problem leads to the familiar conclusion that such grains sublimate rapidly. Here we show that charging plays a critical role in determining the sublimation rate, because an electric field helps to bind molecules to the grain surface. A key aspect of the charging process is that the conduction band of solid hydrogen lies above the vacuum free-electron energy level, so low-energy electrons cannot penetrate the solid. But they are attracted by the dielectric and by positive ions in the matrix, so they become trapped in vacuum states just above the surface. This charge-separated configuration suppresses recombination and permits overall neutrality, while supporting large electric fields at the…
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