Experimental observation and analysis of the 3ν1(Σg) stretching vibrational state of acetylene using continuous-wave infrared stimulated emission

Mikael Siltanen, Markus Metsälä, Markku Vainio, Lauri Halonen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

We present a sensitive experimental method for molecular spectroscopy that can be used to determine ro-vibrational states using mid-infrared stimulated emission. Our infrared stimulated emission probing (IRSEP) experiment is based on using a narrow-line, continuous-wave Ti:sapphire laser beam (pump) to excite the molecules to an upper vibrational state and a continuous-wave, mid-infrared beam from an optical parametric oscillator (probe) to detect the stimulated emission by the excited molecules. Spectroscopic data are gathered by tuning the wavelengths of the beams. The molecules are probed before their velocity distribution is disturbed by collisions, which leads to a sub-Doppler resolution. The full width at half maximum of the emission peaks is below 10 MHz. The stimulated emission lines are measured with an accuracy of at least 0.005 cm−1. We use the IRSEP experiment to observe and analyze the symmetric ro-vibrational state [21+] (3ν1(Σg)) of acetylene (C2H2). This state is not accessible via one photon transitions from the ground vibrational state. We use the least-squares method to determine that the band center is at 9991.9725 (12) cm−1 and the rotational parameters are B = 1.156145 (22) and D = 1.608 (87) × 10−6 cm−1, where the uncertainties in parentheses are one-standard errors in the least significant digit.
Original languageEnglish
Article number054201
Number of pages7
JournalJournal of Chemical Physics
Volume139
Issue number5
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Acetylene
Stimulated emission
stimulated emission
vibrational states
acetylene
Stretching
continuous radiation
Infrared radiation
Molecules
Molecular spectroscopy
molecules
molecular spectroscopy
Optical parametric oscillators
digits
Aluminum Oxide
least squares method
Full width at half maximum
parametric amplifiers
Velocity distribution
Laser beams

Keywords

  • stimulated emission
  • vibrational states
  • mirrors
  • atomic beams
  • linewidths
  • molecular spectroscopy

Cite this

@article{add9704206c840ff95088f7ee2897222,
title = "Experimental observation and analysis of the 3ν1(Σg) stretching vibrational state of acetylene using continuous-wave infrared stimulated emission",
abstract = "We present a sensitive experimental method for molecular spectroscopy that can be used to determine ro-vibrational states using mid-infrared stimulated emission. Our infrared stimulated emission probing (IRSEP) experiment is based on using a narrow-line, continuous-wave Ti:sapphire laser beam (pump) to excite the molecules to an upper vibrational state and a continuous-wave, mid-infrared beam from an optical parametric oscillator (probe) to detect the stimulated emission by the excited molecules. Spectroscopic data are gathered by tuning the wavelengths of the beams. The molecules are probed before their velocity distribution is disturbed by collisions, which leads to a sub-Doppler resolution. The full width at half maximum of the emission peaks is below 10 MHz. The stimulated emission lines are measured with an accuracy of at least 0.005 cm−1. We use the IRSEP experiment to observe and analyze the symmetric ro-vibrational state [21+] (3ν1(Σg)) of acetylene (C2H2). This state is not accessible via one photon transitions from the ground vibrational state. We use the least-squares method to determine that the band center is at 9991.9725 (12) cm−1 and the rotational parameters are B = 1.156145 (22) and D = 1.608 (87) × 10−6 cm−1, where the uncertainties in parentheses are one-standard errors in the least significant digit.",
keywords = "stimulated emission, vibrational states, mirrors, atomic beams, linewidths, molecular spectroscopy",
author = "Mikael Siltanen and Markus Mets{\"a}l{\"a} and Markku Vainio and Lauri Halonen",
year = "2013",
doi = "10.1063/1.4816524",
language = "English",
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journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics AIP",
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Experimental observation and analysis of the 3ν1(Σg) stretching vibrational state of acetylene using continuous-wave infrared stimulated emission. / Siltanen, Mikael; Metsälä, Markus; Vainio, Markku; Halonen, Lauri (Corresponding Author).

In: Journal of Chemical Physics, Vol. 139, No. 5, 054201, 2013.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental observation and analysis of the 3ν1(Σg) stretching vibrational state of acetylene using continuous-wave infrared stimulated emission

AU - Siltanen, Mikael

AU - Metsälä, Markus

AU - Vainio, Markku

AU - Halonen, Lauri

PY - 2013

Y1 - 2013

N2 - We present a sensitive experimental method for molecular spectroscopy that can be used to determine ro-vibrational states using mid-infrared stimulated emission. Our infrared stimulated emission probing (IRSEP) experiment is based on using a narrow-line, continuous-wave Ti:sapphire laser beam (pump) to excite the molecules to an upper vibrational state and a continuous-wave, mid-infrared beam from an optical parametric oscillator (probe) to detect the stimulated emission by the excited molecules. Spectroscopic data are gathered by tuning the wavelengths of the beams. The molecules are probed before their velocity distribution is disturbed by collisions, which leads to a sub-Doppler resolution. The full width at half maximum of the emission peaks is below 10 MHz. The stimulated emission lines are measured with an accuracy of at least 0.005 cm−1. We use the IRSEP experiment to observe and analyze the symmetric ro-vibrational state [21+] (3ν1(Σg)) of acetylene (C2H2). This state is not accessible via one photon transitions from the ground vibrational state. We use the least-squares method to determine that the band center is at 9991.9725 (12) cm−1 and the rotational parameters are B = 1.156145 (22) and D = 1.608 (87) × 10−6 cm−1, where the uncertainties in parentheses are one-standard errors in the least significant digit.

AB - We present a sensitive experimental method for molecular spectroscopy that can be used to determine ro-vibrational states using mid-infrared stimulated emission. Our infrared stimulated emission probing (IRSEP) experiment is based on using a narrow-line, continuous-wave Ti:sapphire laser beam (pump) to excite the molecules to an upper vibrational state and a continuous-wave, mid-infrared beam from an optical parametric oscillator (probe) to detect the stimulated emission by the excited molecules. Spectroscopic data are gathered by tuning the wavelengths of the beams. The molecules are probed before their velocity distribution is disturbed by collisions, which leads to a sub-Doppler resolution. The full width at half maximum of the emission peaks is below 10 MHz. The stimulated emission lines are measured with an accuracy of at least 0.005 cm−1. We use the IRSEP experiment to observe and analyze the symmetric ro-vibrational state [21+] (3ν1(Σg)) of acetylene (C2H2). This state is not accessible via one photon transitions from the ground vibrational state. We use the least-squares method to determine that the band center is at 9991.9725 (12) cm−1 and the rotational parameters are B = 1.156145 (22) and D = 1.608 (87) × 10−6 cm−1, where the uncertainties in parentheses are one-standard errors in the least significant digit.

KW - stimulated emission

KW - vibrational states

KW - mirrors

KW - atomic beams

KW - linewidths

KW - molecular spectroscopy

U2 - 10.1063/1.4816524

DO - 10.1063/1.4816524

M3 - Article

VL - 139

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

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ER -