### Abstract

The topic of this chapter is the use of a recorded diatomic spectrum as a diagnostic tool. In this application of diatomic spectroscopy, one attempts to infer the physical environment from a spectrum produced by that environment. In current practice, temperature is normally the state variable inferred from a recorded spectrum. A concise review of applied diatomic quantum theory is given with emphasis on how a line strength table (a line list of a particular spectrum which includes the line strengths) is created from accurate measurements of line positions. An algorithm is given for finding the molecular parameters in the upper and lower Hamiltonians by fitting calculated term value differences to measured line positions. Once the molecular parameters have been found, one can compute the line positions and H¨onl-London factors even for those lines that were not included in the fitting (i.e., lines that are not experimentally known with high accuracy.) Additionally using the electronic transition moment and the Franck-Condon factors, one can compute the line strength table for the spectrum. Several examples are given showing what type of synthetic spectra can be computed from the line strength table.

Original language | English |
---|---|

Title of host publication | Spectroscopy, Dynamics and Molecular Thoery of Carbon Plasmas and Vapors: Advances in the Understanding of the Most Complex High-Temperature Elemental System |

Publisher | World Scientific Publishing Co. |

Pages | 113-165 |

Number of pages | 53 |

ISBN (Electronic) | 9789812837653 |

ISBN (Print) | 9812837647, 9789812837646 |

DOIs | |

Publication status | Published - Jan 1 2011 |

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### ASJC Scopus subject areas

- Biochemistry, Genetics and Molecular Biology(all)
- Chemistry(all)
- Engineering(all)

### Cite this

*Spectroscopy, Dynamics and Molecular Thoery of Carbon Plasmas and Vapors: Advances in the Understanding of the Most Complex High-Temperature Elemental System*(pp. 113-165). World Scientific Publishing Co.. https://doi.org/10.1142/9789812837653_0004

**Spectroscopy of carbon containing diatomic molecules.** / Hornkohl, James O.; Nemes, L.; Parigger, Christian.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Spectroscopy, Dynamics and Molecular Thoery of Carbon Plasmas and Vapors: Advances in the Understanding of the Most Complex High-Temperature Elemental System.*World Scientific Publishing Co., pp. 113-165. https://doi.org/10.1142/9789812837653_0004

}

TY - CHAP

T1 - Spectroscopy of carbon containing diatomic molecules

AU - Hornkohl, James O.

AU - Nemes, L.

AU - Parigger, Christian

PY - 2011/1/1

Y1 - 2011/1/1

N2 - The topic of this chapter is the use of a recorded diatomic spectrum as a diagnostic tool. In this application of diatomic spectroscopy, one attempts to infer the physical environment from a spectrum produced by that environment. In current practice, temperature is normally the state variable inferred from a recorded spectrum. A concise review of applied diatomic quantum theory is given with emphasis on how a line strength table (a line list of a particular spectrum which includes the line strengths) is created from accurate measurements of line positions. An algorithm is given for finding the molecular parameters in the upper and lower Hamiltonians by fitting calculated term value differences to measured line positions. Once the molecular parameters have been found, one can compute the line positions and H¨onl-London factors even for those lines that were not included in the fitting (i.e., lines that are not experimentally known with high accuracy.) Additionally using the electronic transition moment and the Franck-Condon factors, one can compute the line strength table for the spectrum. Several examples are given showing what type of synthetic spectra can be computed from the line strength table.

AB - The topic of this chapter is the use of a recorded diatomic spectrum as a diagnostic tool. In this application of diatomic spectroscopy, one attempts to infer the physical environment from a spectrum produced by that environment. In current practice, temperature is normally the state variable inferred from a recorded spectrum. A concise review of applied diatomic quantum theory is given with emphasis on how a line strength table (a line list of a particular spectrum which includes the line strengths) is created from accurate measurements of line positions. An algorithm is given for finding the molecular parameters in the upper and lower Hamiltonians by fitting calculated term value differences to measured line positions. Once the molecular parameters have been found, one can compute the line positions and H¨onl-London factors even for those lines that were not included in the fitting (i.e., lines that are not experimentally known with high accuracy.) Additionally using the electronic transition moment and the Franck-Condon factors, one can compute the line strength table for the spectrum. Several examples are given showing what type of synthetic spectra can be computed from the line strength table.

UR - http://www.scopus.com/inward/record.url?scp=84970997368&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84970997368&partnerID=8YFLogxK

U2 - 10.1142/9789812837653_0004

DO - 10.1142/9789812837653_0004

M3 - Chapter

SN - 9812837647

SN - 9789812837646

SP - 113

EP - 165

BT - Spectroscopy, Dynamics and Molecular Thoery of Carbon Plasmas and Vapors: Advances in the Understanding of the Most Complex High-Temperature Elemental System

PB - World Scientific Publishing Co.

ER -