Rotational state distribution of N2 + produced from N2 or N2O observed by a laser-synchrotron radiation combination technique

Hiromichi Niikura, Masakazu Mizutani, Koichiro Mitsuke

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Pump-probe spectroscopy combined with laser and synchrotron radiation is performed to study the ionization and dissociation dynamics of N2 and N2O in the extreme ultraviolet energy region. The N2 +(X 2Σ+ g, v, N) ion produced from N2 or N2O by synchrotron radiation excitation is detected by laser-induced fluorescence (LIF) spectroscopy. To increase the number density of ions produced by synchrotron radiation photoexcitation, a cylindrical ion trap cell is employed. The effect of thermalization on the internal state distributions of N2 + ion can be ignored in the ion trap. The rotational structure of the electronic excitation B 2Σ+ u, v′=0, N′ ← X 2Σ+ g, v″=0, N″ of N2 + produced from N2 is clearly resolved by using a narrow-bandwidth Ti:sapphire laser. The yield curves for N2 +(X 2Σ+ g, v=0, 1) are also measured as a function of the photon energy of the synchrotron radiation. The rotational temperature of N2 +(X 2Σ+ g, v=0) produced from N2O+(B 2Π) is determined from a LIF spectrum to be in the range 200-230 K. The analysis based on the impulsive model indicates that the equilibrium bond angle of the vibrational ground state of N2O+(B 2Π) is >160°.

Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalChemical Physics Letters
Volume317
Issue number1-2
Publication statusPublished - 2000 Jan 28
Externally publishedYes

Fingerprint

rotational states
Laser radiation
Synchrotron radiation
synchrotron radiation
Ions
laser induced fluorescence
lasers
Lasers
ions
photoexcitation
Aluminum Oxide
spectroscopy
Photoexcitation
excitation
Fluorescence spectroscopy
sapphire
Ground state
Ionization
laser beams
dissociation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Rotational state distribution of N2 + produced from N2 or N2O observed by a laser-synchrotron radiation combination technique. / Niikura, Hiromichi; Mizutani, Masakazu; Mitsuke, Koichiro.

In: Chemical Physics Letters, Vol. 317, No. 1-2, 28.01.2000, p. 45-52.

Research output: Contribution to journalArticle

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AB - Pump-probe spectroscopy combined with laser and synchrotron radiation is performed to study the ionization and dissociation dynamics of N2 and N2O in the extreme ultraviolet energy region. The N2 +(X 2Σ+ g, v, N) ion produced from N2 or N2O by synchrotron radiation excitation is detected by laser-induced fluorescence (LIF) spectroscopy. To increase the number density of ions produced by synchrotron radiation photoexcitation, a cylindrical ion trap cell is employed. The effect of thermalization on the internal state distributions of N2 + ion can be ignored in the ion trap. The rotational structure of the electronic excitation B 2Σ+ u, v′=0, N′ ← X 2Σ+ g, v″=0, N″ of N2 + produced from N2 is clearly resolved by using a narrow-bandwidth Ti:sapphire laser. The yield curves for N2 +(X 2Σ+ g, v=0, 1) are also measured as a function of the photon energy of the synchrotron radiation. The rotational temperature of N2 +(X 2Σ+ g, v=0) produced from N2O+(B 2Π) is determined from a LIF spectrum to be in the range 200-230 K. The analysis based on the impulsive model indicates that the equilibrium bond angle of the vibrational ground state of N2O+(B 2Π) is >160°.

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