constants-and-references

The repository contains the values of several physical constants and references of the standard sources.

$\textbf{Constant}$	$\textbf{Value}$	$\textbf{Reference}$
Mass of electron	9.1093837015 x 10-31 kg 5.48579909065 x 10-4 amu	https://physics.nist.gov/cgi-bin/cuu/Value?me https://physics.nist.gov/cgi-bin/cuu/Value?meu
Mass of proton	1.67262192369 x 10-27 kg 1.00727646621 amu	https://physics.nist.gov/cgi-bin/cuu/Value?mp https://physics.nist.gov/cgi-bin/cuu/Value?mpu mass in gram/mol=(mass in gram)x(Avogadro number)
Avogadro constant	6.02214076 x 1023 mol-1	https://physics.nist.gov/cgi-bin/cuu/Value?na
Atomic mass of 1H	1.00782503223 amu	https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=D&all=all&ascii=html&isotype=some
Nuclear mass of 1H	1.00727645232 amu	Calculated: (atomic mass of 1H - me-)

$\color{Blue}{\large{\textsf{Note:}}}$ $\color{red}\text{Atomic mass differs from nuclear mass. It can be calculated by subtracting the total mass of the electrons from the atomic mass.}$ $\color{red}\text{Nuclear mass is considered when properties such as nuclear dynamics are studied.}$

$\textbf{Conversion factors}$

Description	Value	Reference or Note
Atomic mass unit (amu or g/mol) to atomic unit of mass	1822.88847255	Formula = $\frac{\text{1 amu}}{\text{mass of electron in amu}}$
1 bohr to angstrom $\mathring{A}$	0.529177210903	https://physics.nist.gov/cgi-bin/cuu/Value?bohrrada0
1 angstrom ($\mathring{A}$) to bohr	1.8897261246303	Formula = $\frac{1}{0.529177210903}$

$\textbf{Important resources}$

Description	Reference
Atomic mass, atomic mass, and relative isotopic composition of all the elements	https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=D&all=all&ascii=html&isotype=some