Unit Ha
Name hartree
Category Energy
Details The Hartree (Ha) is a unit of energy commonly used in quantum chemistry and atomic physics, particularly in the field of computational chemistry and electronic structure calculations. It is named after the British physicist Douglas Hartree, who was a pioneer in this field.

In Hartree atomic units, one Hartree is the natural unit of energy equal to approximately 27.211386245 electron volts (eV) or 4.35974 × 10^(-18) joules (J). It represents the energy required to: (1) ionize an electron in a hydrogen atom from the ground state (the lowest energy level) or (2) create an electron-hole pair in a hydrogen atom. The unit thus simplifies atomic-scale calculations and provides a convenient way to express and compare energies for various atomic and molecular phenomena.
Ha(hartree) to acal(attocalorie)Ha(hartree) to acal [15 °C](attocalorie)Ha(hartree) to acal [IT](attocalorie)Ha(hartree) to aeV(attoelectron volt)Ha(hartree) to aJ(attojoule)Ha(hartree) to at [TNT](attotonne)Ha(hartree) to aW h(attowatt hour)Ha(hartree) to BTU(British thermal unit)Ha(hartree) to BTU [15 °C](British thermal unit)Ha(hartree) to BTU [IT](British thermal unit)Ha(hartree) to cal(calorie)Ha(hartree) to cal [15 °C](calorie)Ha(hartree) to Cal [food](calorie)Ha(hartree) to cal [IT](calorie)Ha(hartree) to ccal(centicalorie)Ha(hartree) to ccal [15 °C](centicalorie)Ha(hartree) to ccal [IT](centicalorie)Ha(hartree) to ceV(centielectron volt)Ha(hartree) to cJ(centijoule)Ha(hartree) to ct [TNT](centitonne)Ha(hartree) to cW h(centiwatt hour)Ha(hartree) to dacal(decacalorie)Ha(hartree) to dacal [15 °C](decacalorie)Ha(hartree) to dacal [IT](decacalorie)Ha(hartree) to daeV(decaelectron volt)Ha(hartree) to daJ(decajoule)Ha(hartree) to dat [TNT](decatonne)Ha(hartree) to daW h(decawatt hour)Ha(hartree) to dcal(decicalorie)Ha(hartree) to dcal [15 °C](decicalorie)Ha(hartree) to dcal [IT](decicalorie)Ha(hartree) to deV(decielectron volt)Ha(hartree) to dJ(decijoule)Ha(hartree) to dt [TNT](decitonne)Ha(hartree) to Dth [EC](decatherm)Ha(hartree) to dW h(deciwatt hour)Ha(hartree) to Ecal(exacalorie)Ha(hartree) to Ecal [15 °C](exacalorie)Ha(hartree) to Ecal [IT](exacalorie)Ha(hartree) to EeV(exaelectron volt)Ha(hartree) to EJ(exajoule)Ha(hartree) to ergHa(hartree) to Et [TNT](exatonne)Ha(hartree) to eV(electron volt)Ha(hartree) to EW h(exawatt hour)Ha(hartree) to fcal(femtocalorie)Ha(hartree) to fcal [15 °C](femtocalorie)Ha(hartree) to fcal [IT](femtocalorie)Ha(hartree) to feV(femtoelectron volt)Ha(hartree) to fJ(femtojoule)Ha(hartree) to ft lbf(foot-pound force)Ha(hartree) to ft [TNT](femtotonne)Ha(hartree) to fW h(femtowatt hour)Ha(hartree) to Gcal(gigacalorie)Ha(hartree) to Gcal [15 °C](gigacalorie)Ha(hartree) to Gcal [IT](gigacalorie)Ha(hartree) to GeV(gigaelectron volt)Ha(hartree) to GJ(gigajoule)Ha(hartree) to Gt [TNT](gigatonne)Ha(hartree) to GW h(gigawatt hour)Ha(hartree) to hcal(hectocalorie)Ha(hartree) to hcal [15 °C](hectocalorie)Ha(hartree) to hcal [IT](hectocalorie)Ha(hartree) to heV(hectoelectron volt)Ha(hartree) to hJ(hectojoule)Ha(hartree) to ht [TNT](hectotonne)Ha(hartree) to hW h(hectowatt hour)Ha(hartree) to J(joule)Ha(hartree) to kcal(kilocalorie)Ha(hartree) to kcal [15 °C](kilocalorie)Ha(hartree) to kcal [IT](kilocalorie)Ha(hartree) to keV(kiloelectron volt)Ha(hartree) to kJ(kilojoule)Ha(hartree) to kt [TNT](kilotonne)Ha(hartree) to kW h(kilowatt hour)Ha(hartree) to MBTU [IT](thousand British thermal units)Ha(hartree) to Mcal(megacalorie)Ha(hartree) to mcal(millicalorie)Ha(hartree) to Mcal [15 °C](megacalorie)Ha(hartree) to mcal [15 °C](millicalorie)Ha(hartree) to Mcal [IT](megacalorie)Ha(hartree) to mcal [IT](millicalorie)Ha(hartree) to MDth [EC](thousand decatherms)Ha(hartree) to MeV(megaelectron volt)Ha(hartree) to meV(millielectron volt)Ha(hartree) to MJ(megajoule)Ha(hartree) to mJ(millijoule)Ha(hartree) to MMBTU [IT](million British thermal units)Ha(hartree) to MMDth [EC](million decatherms)Ha(hartree) to Mt [TNT](megatonne)Ha(hartree) to mt [TNT](millitonne)Ha(hartree) to MW h(megawatt hour)Ha(hartree) to mW h(milliwatt hour)Ha(hartree) to ncal(nanocalorie)Ha(hartree) to ncal [15 °C](nanocalorie)Ha(hartree) to ncal [IT](nanocalorie)Ha(hartree) to neV(nanoelectron volt)Ha(hartree) to nJ(nanojoule)Ha(hartree) to nt [TNT](nanotonne)Ha(hartree) to nW h(nanowatt hour)Ha(hartree) to Pcal(petacalorie)Ha(hartree) to pcal(picocalorie)Ha(hartree) to Pcal [15 °C](petacalorie)Ha(hartree) to pcal [15 °C](picocalorie)Ha(hartree) to Pcal [IT](petacalorie)Ha(hartree) to pcal [IT](picocalorie)Ha(hartree) to PeV(petaelectron volt)Ha(hartree) to peV(picoelectron volt)Ha(hartree) to PJ(petajoule)Ha(hartree) to pJ(picojoule)Ha(hartree) to Pt [TNT](petatonne)Ha(hartree) to pt [TNT](picotonne)Ha(hartree) to PW h(petawatt hour)Ha(hartree) to pW h(picowatt hour)Ha(hartree) to quadHa(hartree) to t [TNT](tonne)Ha(hartree) to Tcal(teracalorie)Ha(hartree) to Tcal [15 °C](teracalorie)Ha(hartree) to Tcal [IT](teracalorie)Ha(hartree) to TeV(teraelectron volt)Ha(hartree) to th(thermie)Ha(hartree) to thm [EC](therm)Ha(hartree) to thm [Imperial](therm)Ha(hartree) to thm [US](therm)Ha(hartree) to TJ(terajoule)Ha(hartree) to toe(tonne of oil equivalent)Ha(hartree) to Tt [TNT](teratonne)Ha(hartree) to TW h(terawatt hour)Ha(hartree) to W h(watt hour)Ha(hartree) to ycal(yoctocalorie)Ha(hartree) to Ycal(yottacalorie)Ha(hartree) to ycal [15 °C](yoctocalorie)Ha(hartree) to Ycal [15 °C](yottacalorie)Ha(hartree) to ycal [IT](yoctocalorie)Ha(hartree) to Ycal [IT](yottacalorie)Ha(hartree) to yeV(yoctoelectron volt)Ha(hartree) to YeV(yottaelectron volt)Ha(hartree) to yJ(yoctojoule)Ha(hartree) to YJ(yottajoule)Ha(hartree) to yt [TNT](yoctotonne)Ha(hartree) to Yt [TNT](yottatonne)Ha(hartree) to yW h(yoctowatt hour)Ha(hartree) to YW h(yottawatt hour)Ha(hartree) to zcal(zeptocalorie)Ha(hartree) to Zcal(zettacalorie)Ha(hartree) to zcal [15 °C](zeptocalorie)Ha(hartree) to Zcal [15 °C](zettacalorie)Ha(hartree) to zcal [IT](zeptocalorie)Ha(hartree) to Zcal [IT](zettacalorie)Ha(hartree) to zeV(zeptoelectron volt)Ha(hartree) to ZeV(zettaelectron volt)Ha(hartree) to zJ(zeptojoule)Ha(hartree) to ZJ(zettajoule)Ha(hartree) to zt [TNT](zeptotonne)Ha(hartree) to Zt [TNT](zettatonne)Ha(hartree) to zW h(zeptowatt hour)Ha(hartree) to ZW h(zettawatt hour)Ha(hartree) to µcal(microcalorie)Ha(hartree) to µcal [15 °C](microcalorie)Ha(hartree) to µcal [IT](microcalorie)Ha(hartree) to µeV(microelectron volt)Ha(hartree) to µJ(microjoule)Ha(hartree) to µt [TNT](microtonne)Ha(hartree) to µW h(microwatt hour)