Physics:Quantum atoms/isotopes of hydrogen: Difference between revisions

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'''Hydrogen isotopes''' are atoms with one proton in the nucleus and different numbers of neutrons. The three named isotopes are '''protium''' (<math>^1\mathrm{H}</math>), '''deuterium''' (<math>^2\mathrm{H}</math> or D), and '''tritium''' (<math>^3\mathrm{H}</math> or T).
Hydrogen isotopes are a Book II topic in the Quantum Collection. They are atoms with one proton in the nucleus and different numbers of neutrons: protium, deuterium, and tritium. Isotopic mass changes the reduced mass of the electron-nucleus system, producing measurable isotope shifts in atomic spectra. Nuclear spin also affects hyperfine structure and molecular behavior. Hydrogen isotopes are important in precision spectroscopy, isotope chemistry, fusion research, nuclear physics, cosmology, and tests of simple quantum systems.
 
Hydrogen isotopes are important in atomic physics because the nucleus affects the reduced mass, hyperfine structure, isotope shifts, and precision spectroscopy of hydrogen-like systems.
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== Quantum effects ==
== Quantum effects ==
Different hydrogen isotopes have slightly different atomic energy levels because the nuclear mass changes the reduced mass of the electron-nucleus system. These isotope shifts are measured in high-precision spectroscopy.
Different hydrogen isotopes have slightly different atomic energy levels because the nuclear mass changes the reduced mass of the electron-nucleus system. These isotope shifts are measured in high-precision spectroscopy.<ref>{{Cite journal |last=Prohaska |first=Thomas |last2=Irrgeher |first2=Johanna |last3=Benefield |first3=Jacqueline |last4=Böhlke |first4=John K. |last5=Chesson |first5=Lesley A. |title=Standard atomic weights of the elements 2021 |journal=Pure and Applied Chemistry |year=2022 |doi=10.1515/pac-2019-0603}}</ref>


The nuclear spin also affects hyperfine splitting. Ordinary hydrogen and deuterium have different nuclear spin values, so their hyperfine spectra differ. Tritium is radioactive, but it is still useful in nuclear and atomic physics contexts.
The nuclear spin also affects hyperfine splitting. Ordinary hydrogen and deuterium have different nuclear spin values, so their hyperfine spectra differ. Tritium is radioactive, but it is still useful in nuclear and atomic physics contexts.


== Related pages ==
== See also ==
* [[Physics:Quantum atoms/hydrogen]]
{{#invoke:PhysicsQC|tocHeadingAndList|Physics:Quantum basics/See also/Matter}}
* [[Physics:Quantum atoms/energy level]]
* [[Physics:Quantum Spectral lines and series]]
* [[Physics:Quantum atomic nucleus]]
* isotope shifts in atomic spectra


== References ==
== References ==
{{reflist|3}}
{{reflist|3}}
* {{Cite web |title=Hydrogen |url=https://www.britannica.com/science/hydrogen |website=Encyclopaedia Britannica |access-date=2026-05-23}}
* {{Cite web |title=Isotopes of hydrogen |url=https://www.britannica.com/science/hydrogen/Isotopes-of-hydrogen |website=Encyclopaedia Britannica |access-date=2026-05-23}}
* {{Cite web |title=Tritium |url=https://www.epa.gov/radiation/radionuclide-basics-tritium |publisher=United States Environmental Protection Agency |access-date=2026-05-23}}


{{Author|Harold Foppele}}
{{Author|Harold Foppele}}

Latest revision as of 23:02, 23 May 2026

← Back to Atoms Book II

Hydrogen isotopes are a Book II topic in the Quantum Collection. They are atoms with one proton in the nucleus and different numbers of neutrons: protium, deuterium, and tritium. Isotopic mass changes the reduced mass of the electron-nucleus system, producing measurable isotope shifts in atomic spectra. Nuclear spin also affects hyperfine structure and molecular behavior. Hydrogen isotopes are important in precision spectroscopy, isotope chemistry, fusion research, nuclear physics, cosmology, and tests of simple quantum systems.

The three commonly discussed isotopes of hydrogen: protium, deuterium, and tritium.

Main isotopes

Isotope Symbol Nucleus Stability Notes
Protium 1H one proton stable Most common hydrogen isotope; no neutron.
Deuterium 2H or D one proton and one neutron stable Used in heavy water, isotope labeling, and precision spectroscopy.
Tritium 3H or T one proton and two neutrons radioactive Beta emitter with a half-life of about 12.3 years; used in tracing and fusion research.

Quantum effects

Different hydrogen isotopes have slightly different atomic energy levels because the nuclear mass changes the reduced mass of the electron-nucleus system. These isotope shifts are measured in high-precision spectroscopy.[1]

The nuclear spin also affects hyperfine splitting. Ordinary hydrogen and deuterium have different nuclear spin values, so their hyperfine spectra differ. Tritium is radioactive, but it is still useful in nuclear and atomic physics contexts.

See also

Table of contents (84 articles)

Index

Full contents

References

  1. ↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A. (2022). "Standard atomic weights of the elements 2021". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. 


Author: Harold Foppele


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