The utility of a biased activation cell for laser-ion beam photodissociation studies

Tecklenburg, Ronald E.; Sellers-Hann, L.; Russell, David H.

doi:10.1016/0168-1176(89)80010-2

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…At the critical pressure of neutral gas, voltage breakdown produces a short duration fast-neutral beam. The neutral beam densities (100-150 µ ; as measured on the source control unit) are much greater than those used for continuous FAB experiments (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) µ ). The high neutral beam densities used in the pulsed FAB mode have no deleterious effect upon the operation of the FAB gun.…”

Section: Methodsmentioning

confidence: 89%

“…The choice of collision-induced dissociation and photodissociation reaction channels to monitor were made on the basis of signal intensity and the presence of background signal (i.e., chemical noise). Because the major source of noise in the photodissociation experiment arises from metastable background signals (19), we chose to monitor CID and photodissociation reactions that have appreciable metastable background. Thus, the signalto-noise ratio for the various signals is directly dependent upon the extent to which the background signals can be removed.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the signalto-noise ratio for the various signals is directly dependent upon the extent to which the background signals can be removed. In a separate paper we have described how an Einsel lens assembly can be used to reduce the magnitude of the metastable ion background (19). In terms of comparing the relative abundance of CID fragment ions there are problems associated with studying CID product ions which are also observed in the metastable ion spectrum (20).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, in this case it would certainly be desirable to eliminate or reduce the amount of metastable ion signal. The metastable background can be reduced by a factor of 20 by using a biased activation cell (19). Use of the biased activation cell reduces the uncertainity in the photodissociation signal for the B2 cleavage reaction of DNP-prolyl-leucine-glycine [M + H]+ ions accordingly, e.g., 1200 ± 40 counts or an uncertainity for the photodissociation signal of 3.3%.…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of pulsed fast-atom bombardment ionization for increased sensitivity of tandem mass spectrometry

Tecklenburg¹,

Castro²,

Russell³

1989

Anal. Chem.

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Section: Methodsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of pulsed fast-atom bombardment ionization for increased sensitivity of tandem mass spectrometry

Tecklenburg¹,

Castro²,

Russell³

1989

Anal. Chem.

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An evaluation of the analytical utility of the photodissociation of fast ion beams

Tecklenburg

Russell

1990

Mass Spectrometry Reviews

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Dependence on scattering angle of the internal energy distribution of products of charge‐changing collisions

Riederer

Cooks

1993

Org. Mass Spectrom.

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The internal energy distributions arising from chargechanging collisions were measured as a function of scattering angle, 0, for the 'thermometer' molecule W(CO),. The experiments were performed by modifying a reversegeometry mass-analyzed ion kinetic energy (MIKE) spectrometer by adding angle-resolving slits which aUow measurement of the scattering angle in the non-focusing plane of the instrument. Charge exchange of W(C0):' with benzene to give W(CO):' , a d charge stripping of W(C0):' on collision with O2 to give W(CO)i+, were studied at 6 keV with the product ions being c o k t e d over hboratory scattering angles selected in the range 0-0.60 ' . Tbe results show that charge-chaaging collisions accompanied by scattering have the potential for depositing extremely large internal energies. The observation of the W(C0)" ion formed in dissociative charge stripping of W(C0):'shows that it is possible to deposit at least 27 eV into the colliding W(C0);. ion; of this energy, 15 eV is d for the cbargwtripping process, leaving 12 eV of internal energy in the nascent W(CO):+*. Even greater internal energies (more than 15 ev) can be deposited into scattered W(CO):' * prodwed by charge exchange of the doubly charged ion. The availability of such high internal energies has potential use in causing dissociation of refractory ions such as those of biomolecules. The average internal energy, eAVE, deposited increases with the scattering angle at a rate of 10 eV degree-' for charge exchange, and at approximately 5 eV degree-' for charge stripping and for simple collision-induced dissociation (CID). This observation suggests that Don-Zero angle charge stripping and CID may occur via similar mechanisms in which direct vibrational activation occurs in small impact parameter collisions which also lead to angular scattering. The higher internal energies and larger 8~y~ YS. 8 dependence observed for charge exchange are consistent with the formation of the products upon a highly repulsive surface associated with coulombic repulsion between the separating products.

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The utility of a biased activation cell for laser-ion beam photodissociation studies

Cited by 5 publications

References 10 publications

Evaluation of pulsed fast-atom bombardment ionization for increased sensitivity of tandem mass spectrometry

Evaluation of pulsed fast-atom bombardment ionization for increased sensitivity of tandem mass spectrometry

An evaluation of the analytical utility of the photodissociation of fast ion beams

Dependence on scattering angle of the internal energy distribution of products of charge‐changing collisions

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