Excited-state dynamics of acetylene excited to individual rotational level of the V04K01 subband.

Authors:
Vladimir I Makarov
Vladimir I Makarov
University of Puerto Rico
San Juan | Puerto Rico
Sergei A Kochubei
Sergei A Kochubei
University of Puerto Rico

J Chem Phys 2006 Jan;124(4):044313

Department of Chemistry, University of Puerto Rico, Rio Piedras, P.O. Box 23346, San Juan, Puerto Rico 00931-3346.

Dynamics of the IR emission induced by excitation of the acetylene molecule using the (3(2)K(a) (0,1,2),A (1)A(u)<--4(1)l(a) (1),X (1)Sigma(g) (+)) transition was investigated. The observed IR emission was assigned to transitions between the ground-state vibrational levels. Acetylene fluorescence quenching induced by external electric and magnetic fields acting upon the system prepared using the (3(4)K(a) (1),A (1)A(u)<--0(0)l(a) (0),X (1)Sigma(g) (+)) excitation was also studied. External electric field creates an additional radiationless pathway to the ground-state levels, coupling levels of the A (1)A(u) excited state to the quasiresonant levels of the X (1)Sigma(g) (+) ground state. The level density of the ground state in the vicinity of the excited state is very high, thus the electric-field-induced transition is irreversible, with the rate constant described by the Fermi rule. Magnetic field alters the decay profile without changing the fluorescence quantum yield in collisionless conditions. IR emission from the CCH transient was detected, and was also affected by the external electric and magnetic fields. Acetylene predissociation was demonstrated to proceed by the direct S(1)-->S(0) mechanism. The results were explained using the previously developed theoretical approach, yielding values of the relevant model parameters.

Download full-text PDF

Source
http://dx.doi.org/10.1063/1.2160510DOI Listing
January 2006
9 Reads
2.95 Impact Factor

Publication Analysis

Top Keywords

molecule 32ka
4
rotational level
4
induced excitation
4
level v04k01
4
excitation acetylene
4
subband dynamics
4
acetylene molecule
4
v04k01 subband
4
individual rotational
4
32ka 012a
4
dynamics acetylene
4
excited-state dynamics
4
012a 1au
4
acetylene excited
4
excited individual
4
emission induced
4
dynamics emission
4
acetylene
2
012a
1
1au
1

Similar Publications

State dynamics of acetylene excited to individual rotational level of the V1(2)K1(0,1,2) subbands.

J Chem Phys 2007 Mar;126(9):094302

Department of Chemistry, University of Puerto Rico, Rio Piedras, P.O. Box 23346, San Juan, Puerto Rico.

The dynamics of the IR emission induced by excitation of the acetylene molecule at the 3(2) Ka2, A1Au<--4(1) la1, X1Sigmag+ transition was investigated. Vibrationally resolved IR emission spectra were recorded at different delay times after the laser excitation pulse. The observed IR emission was assigned to transitions between vibrational levels of the acetylene molecule in the ground state. Read More

View Article
March 2007

Structure and excited-state dynamics of anthracene: ultrahigh-resolution spectroscopy and theoretical calculation.

J Chem Phys 2009 Apr;130(13):134315

Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Rotationally resolved ultrahigh-resolution spectra of the S(1) (1)B(2u)<--S(0) (1)A(g) transition of anthracene-h(10) and anthracene-d(10) have been observed using a single-mode UV laser and a collimated supersonic jet. We have determined rotational constants of the zero-vibrational levels of the S(0) and S(1) states by analyzing the precisely calibrated transition wavenumbers of rotational lines. We measured Zeeman splitting of each rotational line in the external magnetic field, of which the magnitude was small and strongly dependent on the rotational quantum numbers. Read More

View Article
April 2009

The electronic spectrum of the fluoroborane free radical. II. Analysis of laser-induced fluorescence and single vibronic level emission spectra.

J Chem Phys 2009 Apr;130(16):164310

Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA.

Subsequent to our spectroscopic detection of the HBX (X=F, Cl, Br) free radicals (S.-G. He, F. Read More

View Article
April 2009

Nanosecond time-resolved IR emission from molecules excited in a supersonic jet: intramolecular dynamics of NO2 near dissociation.

J Chem Phys 2005 Oct;123(15):154306

Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-632, USA.

IR emission from NO2 cooled in a supersonic jet and excited to a single, B 2B1 state rovibronic level at 22 994.92 cm(-1) above the ground-state zero point was detected with 10(-8)-s time resolution. The IR emission together with the laser-induced fluorescence decay measurement allows the deduction of the relaxation dynamics near the dissociation of NO2. Read More

View Article
October 2005